The Second Crusade (1147–1149) was the second major crusade launched from Europe. It was called in 1145, in response to the fall of the County of Edessa the previous year to the forces of Zengi. The county had been founded during the First Crusade (1095–1099) by Baldwin of Boulogne in 1098. While it was the first Crusader state to be founded, it was also the first to fall.
The Second Crusade was announced by Pope Eugene III, and was the first of the crusades to be led by European kings, namely Louis VII of France and Conrad III of Germany, with help from a number of other important European nobles. The armies of the two kings marched separately across Europe. After crossing Byzantine territory into Anatolia, both armies were separately defeated by the Seljuk Turks. The main Western Christian source, Odo of Deuil, and Syriac Christian sources claim that the Byzantine emperor Manuel I Comnenus secretly hindered the crusaders' progress, particularly in Anatolia where he is alleged to have deliberately ordered Turks to attack them. Louis and Conrad and the remnants of their armies reached Jerusalem and, in 1148, participated in an ill-advised attack on Damascus. The crusade in the east was a failure for the crusaders and a great victory for the Muslims. It would ultimately lead to the fall of Jerusalem and the Third Crusade at the end of the 12th century.
The only success of the Second Crusade came unintentionally to a combined force of Flemish, Frisian, Norman, English, Scottish, and German crusaders in 1147. Travelling from England, by ship, to the Holy Land, the army stopped and helped the Portuguese in the capture of Lisbon, expelling its Moorish occupants.
 Background: the fall of Edessa
Main article: Siege of Edessa
After the First Crusade and the minor Crusade of 1101 there were three crusader states established in the east: the Kingdom of Jerusalem, the Principality of Antioch, and the County of Edessa. A fourth, the County of Tripoli, was established in 1109. Edessa was the most northerly of these, and also the weakest and least populated; as such, it was subject to frequent attacks from the surrounding Muslim states ruled by the Ortoqids, Danishmends, and Seljuk Turks. Count Baldwin II and future count Joscelin of Courtenay were taken captive after their defeat at the Battle of Harran in 1104. Baldwin and Joscelin were both captured a second time in 1122, and although Edessa recovered somewhat after the Battle of Azaz in 1125, Joscelin was killed in battle in 1131. His successor Joscelin II was forced into an alliance with the Byzantine Empire, but in 1143 both the Byzantine emperor John II Comnenus and the King of Jerusalem Fulk of Anjou died. Joscelin had also quarreled with the Count of Tripoli and the Prince of Antioch, leaving Edessa with no powerful allies.
Meanwhile, the Seljuk Zengi, Atabeg of Mosul, had added Aleppo to his rule in 1128. Aleppo was the key to power in Syria, contested between the rulers of Mosul and Damascus. Both Zengi and King Baldwin II turned their attention towards Damascus; Baldwin was defeated outside the city in 1129. Damascus, ruled by the Burid Dynasty, later allied with King Fulk when Zengi besieged the city in 1139 and 1140; the alliance was negotiated by the chronicler Usamah ibn Munqidh.
In late 1144, Joscelin II allied with the Ortoqids and marched out of Edessa with almost his entire army to support the Ortoqid Kara Aslan against Aleppo. Zengi, already seeking to take advantage of Fulk's death in 1143, hurried north to besiege Edessa, which fell to him after a month on 24 December 1144. Manasses of Hierges, Philip of Milly and others were sent from Jerusalem to assist, but arrived too late. Joscelin II continued to rule the remnants of the county from Turbessel, but little by little the rest of the territory was captured by Muslims or sold to the Byzantines. Zengi himself was praised throughout Islam as "defender of the faith" and al-Malik al-Mansur, "the victorious king". He did not pursue an attack on the remaining territory of Edessa, or the Principality of Antioch, as was feared. Events in Mosul compelled him to return home, and he once again set his sights on Damascus. However, he was assassinated by a slave in 1146 and was succeeded in Aleppo by his son Nur ad-Din.
 Quantum praedecessores
Main article: Quantum praedecessores
The news of the fall of Edessa was brought back to Europe first by pilgrims early in 1145, and then by embassies from Antioch, Jerusalem, and Armenia. Bishop Hugh of Jabala reported the news to Pope Eugene III, who issued the bull Quantum praedecessores on 1 December of that year, calling for a second crusade. Hugh also told the Pope of an eastern Christian king, who, it was hoped, would bring relief to the crusader states: this is the first documented mention of Prester John. Eugene did not control Rome and lived instead at Viterbo, but nevertheless the crusade was meant to be more organized and centrally controlled than the First Crusade: the armies would be led by the strongest kings of Europe and a route would be planned beforehand. The initial response to the new crusade bull was poor, and it in fact had to be reissued when it was clear that Louis VII would be taking part in the expedition. Louis VII of France had also been considering a new expedition independently of the Pope, which he announced to his Christmas court at Bourges in 1145. It is debatable whether Louis was planning a crusade of his own or in fact a pilgrimage, as he wanted to fulfil a vow made by his brother Philip to go to the Holy Land, as he had been prevented by death. It is probable that Louis had made this decision independently of hearing about Quantum Praedecessores. In any case, Abbot Suger and other nobles were not in favour of Louis' plans, as he would potentially be gone from the kingdom for several years. Louis consulted Bernard of Clairvaux, who referred him back to Eugene. Now Louis would have definitely heard about the papal bull, and Eugene enthusiastically supported Louis' crusade. The bull was reissued on 1 March 1146, and Eugene authorized Bernard to preach the news throughout France.
 Bernard of Clairvaux
St Bernard in stained glass. From the Upper Rhine, ca. 1450.The Pope commissioned Bernard to preach the Second Crusade and granted the same indulgences for it which Pope Urban II had accorded to the First Crusade. A parliament was convoked at Vezelay in Burgundy in 1146, and Bernard preached before the assembly on March 31st. Louis VII of France, his wife, Eleanor of Aquitaine, and the princes and lords present prostrated themselves at the feet of Bernard to receive the pilgrims' cross. Bernard then passed into Germany, and the reported miracles which multiplied almost at his every step undoubtedly contributed to the success of his mission. At Speyer, Conrad III of Germany and his nephew Frederick Barbarossa, received the cross from the hand of Bernard. Pope Eugenius came in person to France to encourage the enterprise.
For all his overmastering zeal, Bernard was by nature neither a bigot nor a persecutor. As in the First Crusade, the preaching inadvertently led to attacks on Jews; a fanatical French monk named Rudolf was apparently inspiring massacres of Jews in the Rhineland, Cologne, Mainz, Worms, and Speyer, with Rudolf claiming Jews were not contributing financially to the rescue of the Holy Land. Bernard, the Archbishop of Cologne and the Archbishop of Mainz were vehemently opposed to these attacks, and so Bernard traveled from Flanders to Germany to deal with the problem and quiet the mobs. Bernard then found Rudolf in Mainz and was able to silence him, returning him to his monastery.
 Wendish Crusade
Main article: Wendish Crusade
When the Second Crusade was called, many south Germans volunteered to crusade in the Holy Land. The north German Saxons were reluctant. They told St Bernard of their desire to campaign against the Slavs at a Reichstag meeting in Frankfurt on 13 March 1147. Approving of the Saxons' plan, Eugenius issued a papal bull known as the Divina dispensatione on 13 April. This bull stated that there was to be no difference between the spiritual rewards of the different crusaders. Those who volunteered to crusade against the Slavs were primarily Danes, Saxons, and Poles, although there were also some Bohemians. The Papal legate, Anselm of Havelberg, was placed in overall command. The campaign itself was led by Saxon families such as the Ascanians, Wettin, and Schauenburgers.
Upset by German participation in the crusade, the Obotrites preemptively invaded Wagria in June 1147, leading to the march of the crusaders in late summer 1147. After expelling the Obodrites from Christian territory, the crusaders targeted the Obodrite fort at Dobin and the Liutizian fort at Demmin. The forces attacking Dobin included those of the Danes Canute V and Sweyn III, Adalbert II, Archbishop of Bremen, and Duke Henry the Lion of Saxony. When some crusaders advocated ravaging the countryside, others objected by asking, "Is not the land we are devastating our land, and the people we are fighting our people?" The Saxon army under Henry the Lion withdrew after the pagan chief, Niklot, agreed to have Dobin's garrison undergo baptism. After an unsuccessful siege of Demmin, a contingent of crusaders was diverted by the margraves to attack Pomerania instead. They reached the already Christian city Stettin, whereupon the crusaders dispersed after meeting with Bishop Albert of Pomerania and Prince Ratibor I of Pomerania. According to Bernard of Clairvaux, the goal of the crusade was to battle the pagan Slavs "until such a time as, by God's help, they shall either be converted or deleted". However, the crusade failed to achieve the conversion of most of the Wends. The Saxons achieved largely token conversions at Dobin, as the Slavs resorted to their pagan beliefs once the Christian armies dispersed. Albert of Pomerania explained, "If they had come to strengthen the Christian faith ... they should do so be preaching, not by arms".
By the end of the crusade, the countryside of Mecklenburg and Pomerania was plundered and depopulated with much bloodshed, especially by the troops of Henry the Lion. This was to help bring about more Christian victories in the future decades. The Slavic inhabitants also lost much of their methods of production, limiting their resistance in the future.
 Reconquista and the fall of Lisbon
Main article: Siege of Lisbon
The Siege of Lisbon by D. Afonso Henriques by Joaquim Rodrigues Braga (1840)In the spring of 1147, the Pope authorized the expansion of the crusade into the Iberian peninsula, in the context of the Reconquista. He also authorized Alfonso VII of León to equate his campaigns against the Moors with the rest of the Second Crusade. In May 1147, the first contingents of crusaders left from Dartmouth in England for the Holy Land. Bad weather forced the ships to stop on the Portuguese coast, at the northern city of Porto on 16 June 1147. There they were convinced to meet with King Afonso I of Portugal.
The crusaders agreed to help the King attack Lisbon, with a solemn agreement that offered to them the pillage of the city's goods and the ransom money for expected prisoners. The Siege of Lisbon lasted from 1 July to 25 October 1147 when, after four months, the Moorish rulers agreed to surrender, primarily due to hunger within the city. Most of the crusaders settled in the newly captured city, but some of them set sail and continued to the Holy Land. Some of them, who had departed earlier, helped capture Santarém earlier in the same year. Later they also helped to conquer Sintra, Almada, Palmela and Setúbal, and were allowed to stay in the conquered lands, where they had offspring.
Elsewhere on the Iberian Peninsula at almost at the same time, Alfonso VII of León, Ramon Berenguer IV, Count of Barcelona, and others led a mixed army of Catalan and French crusaders against the rich port city of Almería. With support from a Genoese-Pisan navy, the city was occupied in October 1147. Ramon Berenger then invaded the lands of the Almoravid taifa kingdom of Valencia and Murcia. In December 1148, he captured Tortosa after a five-month siege again with the help of French, Anglo-Normans, and Genoese crusaders. The next year, Fraga, Lleida and Mequinenza in the confluence of the Segre and Ebro rivers fell to his army.
 Crusade in the East
Joscelin tried to take back Edessa following Zengi's murder, but Nur ad-Din defeated him in November 1146. On 16 February 1147 the French crusaders met at Étampes to discuss their route. The Germans had already decided to travel overland through Hungary, as the sea route was politically impractical because Roger II, King of Sicily, was an enemy of Conrad. Many of the French nobles distrusted the land route, which would take them through the Byzantine Empire, the reputation of which still suffered from the accounts of the First Crusaders. Nevertheless it was decided to follow Conrad, and to set out on 15 June. Roger II was offended and refused to participate any longer. In France, Abbot Suger and Count William II of Nevers were elected as regents while the king would be on crusade. In Germany, further preaching was done by Adam of Ebrach, and Otto of Freising also took the cross. On 13 March, 1147, at Frankfurt, Conrad’s son Frederick was elected king, under the regency of Henry, Archbishop of Mainz. Five years later Conrad III designated his nephew, Frederick Barbarossa, as his successor. The Germans planned to set out at Easter, but did not leave until May.
 German route
The German crusaders, accompanied by the papal legate and cardinal Theodwin, intended to meet the French in Constantinople. Ottokar III of Styria joined Conrad at Vienna, and Conrad's enemy Geza II of Hungary allowed them to pass through unharmed. When the German army of 20,000 men arrived in Byzantine territory, Manuel feared they were going to attack him, and Byzantine troops were posted to ensure that there was no trouble. There was a brief skirmish with some of the more unruly Germans near Philippopolis and in Adrianople, where the Byzantine general Prosouch fought with Conrad’s nephew, the future emperor Frederick. To make things worse, some of the German soldiers were killed in a flood at the beginning of September. On 10 September, however, they arrived at Constantinople, where relations with Manuel were poor and the Germans were convinced to cross into Asia Minor as quickly as possible. Manuel wanted Conrad to leave some of his troops behind, to assist in defending against attacks from Roger II, who had taken the opportunity to plunder the cities of Greece, but Conrad did not agree, despite being a fellow enemy of Roger. In Asia Minor, Conrad decided not to wait for the French, and marched towards Iconium, capital of the Seljuk Sultanate of Rüm. Conrad split his army into two divisions. The king led one of these, which was almost totally destroyed by the Seljuks on 25 October 1147 at the second battle of Dorylaeum.
In battle, the Turks used their typical tactic of pretending to retreat, and then returning to attack the small force of German cavalry which had separated from the main army to chase them. Conrad began a slow retreat back to Constantinople, and his army was harassed daily by the Turks, who attacked stragglers and defeated the rearguard. Even Conrad was wounded in a skirmish with them. The other division, led by the King's half-brother, Bishop Otto of Freising, had marched south to the Mediterranean coast and was similarly defeated early in 1148.
 French route
The French crusaders had departed from Metz in June 1147, led by Louis, Thierry of Alsace, Renaut I of Bar, Amadeus III of Savoy and his half-brother William V of Montferrat, William VII of Auvergne, and others, along with armies from Lorraine, Brittany, Burgundy, and Aquitaine. A force from Provence, led by Alphonse of Toulouse, chose to wait until August, and to cross by sea. At Worms, Louis joined with crusaders from Normandy and England. They followed Conrad’s route fairly peacefully, although Louis came into conflict with Geza of Hungary when Geza discovered Louis had allowed an attempted Hungarian usurper to join his army. Relations within Byzantine territory were also grim, and the Lorrainers, who had marched ahead of the rest of the French, also came into conflict with the slower Germans whom they met on the way.
Emperor Manuel ISince the original negotiations between Louis and Manuel, Manuel had broken off his military campaign against the Sultanate of Rüm, signing a truce with his enemy Sultan Mesud I. This was done so that Manuel would be free to concentrate on defending his empire from the Crusaders, who had gained a reputation for theft and treachery since the First Crusade and were widely suspected of harbouring sinister designs on Constantinople. Nevertheless, Manuel's relations with the French army were somewhat better than with the Germans, and Louis was entertained lavishly in Constantinople. Some of the French were outraged by Manuel's truce with the Seljuks and called for an alliance with Roger II and an attack on Constantinople, but they were restrained by Louis.
When the armies from Savoy, Auvergne, and Montferrat joined Louis in Constantinople, having taken the land route through Italy and crossing from Brindisi to Durazzo, the entire army was shipped across the Bosporus to Asia Minor. The Greeks were encouraged by rumours that the Germans had captured Iconium, but Manuel refused to give Louis any Byzantine troops. Byzantium had just been invaded by Roger II of Sicily, and all of Manuel's army was needed in the Balkans. Both the Germans and French therefore entered Asia without any Byzantine assistance, unlike the armies of the First Crusade. In the tradition set by his grandfather Alexios I, Manuel also had the French swear to return to the Empire any territory they captured. The French met the remnants of Conrad's army at Nicaea, and Conrad joined Louis' force. They followed Otto of Freising's route, moving closer to the Mediterranean coast, and they arrived at Ephesus in December, where they learned that the Turks were preparing to attack them. Manuel also sent ambassadors complaining about the pillaging and plundering that Louis had done along the way, and there was no guarantee that the Byzantines would assist them against the Turks. Meanwhile Conrad fell sick and returned to Constantinople, where Manuel attended to him personally, and Louis, paying no attention to the warnings of a Turkish attack, marched out from Ephesus with the French and German survivors. The Turks were indeed waiting to attack, but in a small battle outside Ephesus, the French were victorious.
They reached Laodicea early in January 1148, around the same time Otto of Freising’s army had been destroyed in the same area. Resuming the march, the vanguard under Amadeus of Savoy became separated from the rest of the army at Mount Cadmus, and Louis’ troops suffered heavy losses from the Turks. Louis himself, according to Odo of Deuil, climbed a rock and was ignored by the Turks, who did not recognize him. The Turks did not bother to attack further and the French marched on to Adalia, continually harassed from afar by the Turks, who had also burned the land to prevent the French from replenishing their food, both for themselves and their horses. Louis no longer wanted to continue by land, and it was decided to gather a fleet at Adalia and sail for Antioch. After being delayed for a month by storms, most of the promised ships did not arrive at all. Louis and his associates claimed the ships for themselves, while the rest of the army had to resume the long march to Antioch. The army was almost entirely destroyed, either by the Turks or by sickness.
 Journey to Jerusalem
Raymond of Poitiers welcoming Louis VII in Antioch.Louis eventually arrived in Antioch on March 19 after being delayed by storms; Amadeus of Savoy had died on Cyprus along the way. Louis was welcomed by Eleanor’s uncle Raymond of Poitiers. Raymond expected him to help defend against the Turks and to accompany him on an expedition against Aleppo, the Muslim city that was the gateway to Edessa, but Louis refused, preferring instead to finish his pilgrimage to Jerusalem rather than focus on the military aspect of the crusade. Eleanor enjoyed her stay, but her uncle implored her to remain to enlarge family lands and divorce Louis if the king refused to help what was assuredly the military cause of the Crusade. Louis quickly left Antioch for Tripoli with Eleanor in arrest. Meanwhile, Otto of Freising and the remnant of his troops arrived in Jerusalem early in April, and Conrad soon after. Fulk, Patriarch of Jerusalem, was sent to invite Louis to join them. The fleet that had stopped at Lisbon arrived around this time, as well as the Provençals who had left Europe under the command of Alfonso Jordan, Count of Toulouse. Alphonso himself did not make it to Jerusalem as he died at Caesarea. He was supposedly poisoned either by Eleanor of Aquitaine or Raymond II of Tripoli, the nephew who feared his political aspirations in the county. The original focus of the crusade was Edessa, but the preferred target of King Baldwin III and the Knights Templar was Damascus.
 Council of Acre
Main article: Council of Acre
The nobility of Jerusalem welcomed the arrival of troops from Europe, and it was announced that a council should meet to decide on the best target for the crusaders. This took place on 24 June 1148, when the Haute Cour of Jerusalem met with the recently-arrived crusaders from Europe at Palmarea, near Acre, a major city of the crusader Kingdom of Jerusalem. This was the most spectacular meeting of the Cour in its existence.
In the end, the decicion was made to attack the city of Damascus, an former ally of the Kingdom of Jerusalem that had shifted its allegiance to that of the Zengids and attacked the Kingdom's allied city of Bosra in 1147. In July their armies assembled at Tiberias and marched to Damascus, around the Sea of Galilee by way of Banyas. There were perhaps 50,000 troops in total.
 Siege of Damascus
Main article: Siege of Damascus
The crusaders decided to attack Damascus from the west, where orchards would provide them with a constant food supply. They arrived at Daraiya on 23 July. The following day, the Muslims were prepared for the attack and constantly attacked the army advancing through the orchards outside Damascus. The defenders had sought help from Saif ad-Din Ghazi I of Aleppo and Nur ad-Din of Mosul, who personally led an attack on the crusader camp. The crusaders were pushed back from the walls into the orchards, where they were prone to ambushes and guerrilla attacks.
According to William of Tyre, on 27 July the crusaders decided to move to the plain on the eastern side of the city, which was less heavily fortified but had much less food and water. It was recorded by some that Unur had bribed the leaders to move to a less defensible position, and that Unur had promised to break off his alliance with Nur ad-Din if the crusaders went home. Meanwhile Nur ad-Din and Saif ad-Din had by now arrived. With Nur ad-Din in the field it was impossible to return to their better position. The local crusader lords refused to carry on with the siege, and the three kings had no choice but to abandon the city. First Conrad, then the rest of the army, decided to retreat back to Jerusalem on 28 July, though for their entire retreat they were followed by Turkish archers who constantly harassed them. While in retreat in Jerusalem, the French got word of the beheading of Raymond, King of Antioch by the enemy, a major blow for the crusade.
The Mediterranean world after the Second Crusade in 1173.Each of the Christian forces felt betrayed by the other. A new plan was made to attack Ascalon and Conrad took his troops there, but no further help arrived, due to the lack of trust that had resulted from the failed siege. This mutual distrust would linger for a generation due to the defeat, to the ruin of the Christian kingdoms in the Holy Land. After quitting Ascalon, Conrad returned to Constantinople to further his alliance with Manuel. Louis remained behind in Jerusalem until 1149.
Back in Europe, Bernard of Clairvaux was humiliated by the defeat. Bernard considered it his duty to send an apology to the Pope and it is inserted in the second part of his Book of Consideration. There he explains how the sins of the crusaders were the cause of their misfortune and failures. When his attempt to call a new crusade failed, he tried to disassociate himself from the fiasco of the Second Crusade altogether. He would die in 1153.
The Wendish Crusade achieved mixed results. While the Saxons affirmed their possession of Wagria and Polabia, pagans retained control of the Obodrite land east of Lübeck. The Saxons also received tribute from Chief Niklot, enabled the colonization of the Bishopric of Havelberg, and freed some Danish prisoners. However, the disparate Christian leaders regarded their counterparts with suspicion and accused each other of sabotaging the campaign. In Iberia, the campaigns in Spain, along with the siege of Lisbon, were some of the few Christian victories of the Second Crusade. They are seen as pivotal battles of the wider Reconquista, which would be completed in 1492.
In the East the situation was much darker for the Christians. In the Holy Land, the Second Crusade had disastrous long-term consequences for Jerusalem. Damascus no longer trusted the crusader kingdom, and the city was handed over to Nur ad-Din in 1154. Baldwin III finally seized Ascalon in 1153, which brought Egypt into the sphere of conflict. Jerusalem was able to make further advances into Egypt, briefly occupying Cairo in the 1160s. However, relations with the Byzantine Empire were mixed, and reinforcements from Europe were sparse after the disaster of the Second Crusade. King Amalric I of Jerusalem allied with the Byzantines and participated in a combined invasion of Egypt in 1169, but the expedition ultimately failed. In 1171, Saladin, nephew of one of Nur ad-Din's generals, was proclaimed Sultan of Egypt, uniting Egypt and Syria and completely surrounding the crusader kingdom. Meanwhile the Byzantine alliance ended with the death of emperor Manuel I in 1180, and in 1187, Jerusalem capitulated to Saladin. His forces then spread north to capture all but the capital cities of the Crusader States, precipitating the Third Crusade.