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=== Kebangkitan Muslim (tahun 1131 sampai 1174) ===
Sebelum menghembuskan nafas terakhir, Raja Balduinus II mengangkat Fulko, Melisenda, dan putra belia mereka yang bernama [[BauldouinBaudouin III dari Yerusalem|Balduinus]] sebagai ahli-ahli waris bersama.<!-- Fulko intended to revoke the arrangement, but his favouritism toward his compatriots roused strong discontent in the kingdom. In 1134, he repressed a revolt by [[Hugh II of Jaffa]], a relative of Melisende, but was still compelled to accept the shared inheritance. He also thwarted frequent attempts by his sister-in-law Alice to assume the regency in Antioch, including alliances with [[Pons of Tripoli]] and [[Joscelin II, Count of Edessa|Joscelin{{nbsp}}II of Edessa]].{{sfn|Barber|2012|pp=149, 151–155}} Taking advantage of Antioch's weakened position, [[Leo I, Prince of Armenia|Leo]], a [[Cilician Armenia]]n ruler, seized the Cilician plain.{{sfn|Lilie|2004|pp=105–106}} In 1133, the Antiochene nobility asked Fulk to propose a husband for Constance, and he selected [[Raymond of Poitiers]], a younger son of [[William IX of Aquitaine]]. Raymond finally arrived in Antioch three years later and married Constance.{{sfn|Barber|2012|pp=153, 168}} He reconquered parts of Cilicia from the Armenians.{{sfn|Lilie|2004|pp=106–107}} In 1137, Pons was killed battling the Damascenes, and Zengi invaded Tripoli. Fulk intervened, but Zengi's troops captured Pons' successor [[Raymond II, Count of Tripoli|Raymond{{nbsp}}II]], and besieged Fulk in the border castle of [[Montferrand (crusader castle)|Montferrand]]. Fulk surrendered the castle and paid Zengi 50,000{{nbsp}}dinars for his and Raymond's freedom.{{sfn|Barber|2012|pp=165–170}} Emperor Alexios' son and successor, [[John II Komnenos]], reasserted Byzantine claims to Cilicia and Antioch. His military campaign compelled Raymond of Poitiers to give homage and agree that he would surrender Antioch by way of compensation if the Byzantines ever captured Aleppo, [[Homs]], and Shaizar for him. {{sfn|Lilie|2004|pp=120–122}} The following year the Byzantines and Franks jointly besieged Aleppo and Shaizar but could not take the towns. Zengi soon seized Homs from the Damascenes, but a Damascene–Jerusalemite coalition prevented his southward expansion.{{sfn|Cobb|2016|pp=133–134}}
[[File:Acra1148B.jpg|thumb|left|alt=Miniature depicting Louis VIII and Conrad III meeting Melisende and Fulk |Kings Louis VIII and Conrad III meet Queen Melisende and King Baldwin III at Acre from a 13th-century codex]]Joscelin made an alliance with the Artuqid [[Kara Arslan]], who was Zengi's principal Muslim rival in Upper Mesopotamia. While Joscelin was staying west of the Euphrates at Turbessel, Zengi invaded the Frankish lands east of the river in late 1144. Before the end of the year, he captured the region, including the city of Edessa.{{sfn|Cobb|2016|pp=134–135}}{{sfn|Holt|1986|p=42}} Losing Edessa strategically threatened Antioch and limited opportunities for a Jerusalemite expansion in the south. In September 1146, Zengi was assassinated, possibly on orders from Damascus. His empire was divided between his two sons, with the younger [[Nur ad-Din (died 1174)|Nur ad-Din]] succeeding him in Aleppo. A power vacuum in Edessa allowed Joscelin to return to the city, but he was unable to take the citadel. When Nur ad-Din arrived, the Franks were trapped, Joscelin fled and the subsequent sack left the city deserted.{{sfn|Barber|2012|pp=180, 182}}
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