While the rulers of Damascus were preoccupied in conflict with their fellow Seljuqs in Aleppo and Diyarbakir, the Crusaders, who arrived in the Levant in 1097, conquered Jerusalem, Mount Lebanon and Palestine. Duqaq seemed to have been content with Crusader rule as a buffer between his dominion and the Fatimid Caliphate of Egypt. Toghtekin, however, saw the Western invaders as a viable threat to Damascus which, at the time, nominally included Homs, the Beqaa Valley, Hauran, and the Golan Heights as part of its territories. With military support from Sharaf al-Din Mawdud of Mosul, Toghtekin managed to halt Crusader raids in the Golan and Hauran. Mawdud was assassinated in the Umayyad Mosque in 1109, depriving Damascus of northern Muslim backing and forcing Toghtekin to agree to a truce with the Crusaders in 1110. In 1126, the Crusader army led by Baldwin II fought Burid forces led by Toghtekin at Marj al-Saffar near Damascus; however, despite their tactical victory, the Crusaders failed in their objective to capture Damascus.