The city proves too strong to attack, but the fortresses of Biza'a, Athareb, Maarat al-Numan and Kafartab are taken by assault. While the Byzantines besiege the city of Shaizar, the Crusader allies Prince Raymond of Poitiers of Antioch and Count Joscelin II of Edessa remain in their camp playing dice. Siege of Shaizar: The Byzantines under John II besiege the capital of the Munqidhite Emirate. They capture the lower city on May 20, but fail to take the citadel. John negotiates with Emir Abu'l Asakir Sultan – who sends him an offer to pay a large indemnity and becoming a vassal of the Byzantine Empire. John, disgusted by his Crusader allies, accepts the terms and raises the siege on May 21. October 11 – An earthquake in Aleppo, Syria, kills about 230,000 people. Al-Rashid Billah (Deposed caliph of Baghdad) fled to Isfahan where he was assassinated by a team of four Nizari Ismailis (Assassins) in June 1138. This was celebrated in Alamut for a week by Shias. Asia November 5 – Lý Anh Tông is enthroned as emperor of Đại Việt at the age of two, starting a 37-year reign. By topic Religion April 10 – Robert Warelwast is nominated as bishop of Exeter at a royal council in Northampton, England. Births Casimir II (the Just), duke of Poland (d. 1194) Conan IV (the Young), duke of Brittany (d. 1171) Fujiwara no Narichika, Japanese nobleman (d. 1178) Hōjō Tokimasa, Japanese nobleman and regent (d. 1215) Saladin (the Lion), sultan of Egypt and Syria (d. 1193) Taira no Shigemori, Japanese nobleman (d. 1179) Tancred ("the Monkey King"), king of Sicily (d. 1194) Deaths January 13 or January 14 – Simon I, duke of Lorraine (b. 1076) February 19 – Irene Doukaina, Byzantine empress May 11 – William de Warenne, 2nd Earl of Surrey May 27 – Hadmar I of Kuenring, German nobleman June 6 – Al-Rashid, caliph of the Abbasid Caliphate (b. 1109) August 12 – Suero Vermúdez, Asturian nobleman October 28 – Bolesław III (Wrymouth), duke of Poland (b. 1086) Amhlaoibh Mór mac Fir Bhisigh, Irish poet and cleric Arwa al-Sulayhi, queen and co-ruler of Yemen (b. 1048) Avempace, Andalusian polymath and philosopher (b. 1085) Chen Yuyi, Chinese politician of the Song Dynasty (b. 1090) David the Scot, bishop of Bangor (approximate date) Kiya Buzurg Ummid, ruler of the Nizari Isma'ili State Rodrigo Martínez, Leonese nobleman and diplomat Rudolf of