Tutush was a brother of the
Seljuk sultan Malik-Shah I. In 1077, Malik-Shah appointed him to take over the governorship of
Syria. Later that year, Tutush reached
Aleppo, then ruled by the
Mirdasid emir
Sabiq ibn Mahmud, and began a three-month-long siege of the city. In 1078/9, Malik-Shah sent him to
Damascus to help
Atsiz ibn Uvaq, an independent Turkish warlord who had taken the city in 1076, who was being besieged by the
Fatimid forces. After the siege had ended, Tutush had Atsiz executed and installed himself in Damascus. He later expanded his realm by annexing
Sidon,
Gibelacar,
Tiberias,
Ramla,
Jaffa and
Jerusalem, which he granted to
Artuk Bey, another Seljuk commander. He later returned to besieging Aleppo and called for reinforcements from Malik-Shah, yet his reinforcements were ambushed and routed by a coalition of Arab tribesmen led by
Kilabi chief Abu Za'ida at
Wadi Butnan. This forced him to leave Aleppo and to pursue the tribesmen who fled into the desert. Meanwhile, the Aleppines raided Tutush's camp outside the city walls, killing the guards he left behind and seizing all of its provisions. Tutush consequently withdrew to
Diyar Bakr where he spent the winter. In 1080, Tutush determined to capture Aleppo by force, in which he wanted to strip it from its nearby defenses; hence, he seized
Manbij, Hisn al-Faya (at modern-day al-Bira),
Biza'a and
Azaz. He later influenced Sabiq to cede the emirate to the Uqaylid emir
Muslim ibn Quraysh "Sharaf al-Dawla". The headman in Aleppo,
Sharif Hassan ibn Hibat Allah Al-Hutayti, currently under siege by
Suleiman ibn Qutalmish, promised to surrender the city to Tutush. Suleiman was a distant member of the Seljuk dynasty who had established himself in Anatolia and was trying to expand his rule to Aleppo, having captured Antioch in 1084. Tutush and his army met Suleiman's forces near Aleppo in 1086. In the ensuing
battle of Ain Salm, Suleiman's forces fled, Suleiman was killed and his son
Kilic Arslan captured. Tutush attacked and occupied Aleppo except for the
citadel in May 1086, he stayed until October and left for Damascus due to the advance of Malik-Shah's armies. The Sultan himself arrived in December 1086, then he appointed
Aq Sunqur al-Hajib as the governor of Aleppo. Tutush finished the construction of the
Citadel of Damascus, a project begun under the direction of Atsiz. ==Struggle for Sultanate==