Qasīm al-Dawla Sayf al-Dīn Abū Saʿīd Āqsunqur al-Bursuqī (قسیم الدوله سیف الدین ابو سعید آقسنقر البرسقی), also known as Aqsunqur al-Bursuqi, Aqsonqor il-Bursuqi, Aksunkur al-Bursuki, Aksungur or al-Borsoki, was the atabeg of Mosul from 1113–1114 and again from 1124–1126.
A Turkish officer in the Seljuk army, al-Bursuqi was appointed as the representative of Mawdud, the atabeg of Mosul, to the court of the Seljuk sultan Muhammad I Tapar. An unidentified Assassin murdered Mawdud at a mosque in Damascus on 2 October 1113 and shortly thereafter the sultan appointed al-Bursuqi as Mawdud's successor at Mosul. The sultan also ordered his emirs to continue jihad (or holy war) against the Crusader states. Al-Bursuqi launched a devastating raid against the County of Edessa in April and May 1115. As the Artuqid ruler of Mardin, Ilghazi, had declined to participate in the campaign, al-Bursuqi invaded his territory, but Ilghazi defeated his troops. Because of the failure of his campaign, al-Bursuqi stayed in al-Rahba, and Juyûsh-beg was appointed atabeg of Mosul by the sultan.
Al-Bursuqi was reappointed as atabeg of Mosul in 1124 due to insubordination of Juyûsh-beg. Baldwin II of Jerusalem, Joscelin I of Edessa and a Bedouin leader, Dubais ibn Sadaqa laid siege to Aleppo in October 1124. The qadi of Aleppo, Ibn al-Khashshab, approached al-Bursuqi, seeking his assistance. In 1125, he reclaimed Aleppo for the Seljuk sultan Mahmud II. Al-Bursuqi invaded the Principality of Antioch and forced the allied enemy forces to abandon the siege in January 1125. He also supported Toghtekin in the battle of Azaz in 1125, but a Crusader force relieved it. Using the spoils he gained his victory at Azaz, Baldwin II was able to ransom his daughter Ioveta and Joscelin II of Edessa, then held at Aleppo by al-Bursuqi, that had been used to secure Baldwin's own release.
On November 26, 1126, al-Bursuqi was assassinated by a team of 10 Nizaris attacking him with knives while he was at the Great Mosque of Mosul. The assassin's fate is unknown, but he wounded three. The attack was presumably ordered by Mahmud II.
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