تتش بن ألب أرسلان
Duqaq was a son of the Seljuq ruler of Syria, Tutush I, and Khatun Safwat al-Mulk, He was the brother of Ridwan. When their father died in 1095, Ridwan claimed Syria for himself, and Duqaq initially inherited territory in the Jezirah and lived with his brother in Aleppo. However, he soon rebelled and seized control of Damascus, throwing Syria into near anarchy and civil war. Duqaq had the support of Yaghi-Siyan of Antioch, who had no quarrel with Ridwan but disliked his atabeg Janah ad-Dawla; joining Yaghi-Siyan and Duqaq was Ilghazi, governor of Jerusalem. Ridwan allied with Ilghazi's brother Sökmen of Artukids.