Citadel of Damascus
Tutush finished the construction of the Citadel of Damascus, a project begun under the direction of Atsiz. Tutush took control of Syria in 1092, following the death of his brother, Malik Shah I, naming himself Sultan. He marched towards Azerbaijan, in which he managed to capture Nisbis, Amida, Mayyafariqin and Mosul, but he had to return in December 1093, as two Seljuk rulers, Bozan of Edessa and Harran and Aq Sunqur al-Hajib of Aleppo, had switched allegiance and declared their support for his nephew, Sultan Barkiyaruq. However, Tutush along with Yağısıyan of Antioch launched an attack against the dissidents, whom he managed to defeat at Tell Sultan in June–July 1094. Bozan and Aq Sunqur were killed, meanwhile Kerbogha was taken prisoner to Homs.