…his elder brother Saif ad-Din Ghazi I in Mosul, who has him executed.

Saif ad-Din had first to fight to secure his position in Mosul.

Two years before, the Seljuq sultan Ghiyath ad-Din Mas'ud had named his cadet son Alp-Suleiman-Shah b. Muhammad b. Malik Shah as overlord of Zengi, but the latter had neutralized him and carried with him at the siege.

At Zengi's death, Alp-Suleiman-Shah had tried to exploit the ensuing disorder to gain the power in Mosul.

Two of Zengi's advisors, the head of the diwan al-Din Muhammad Jemal and hajab Amir Salah al-Din Muhammad al-Yaghisiyani, took the side of Saif ad-Din: taking advantage of the inexperience of the young Seljuc, giving Saif ad-Din the time necessary to take control of Mosul.

When Alp-Suleiman-Shah appeared in Mosul, he had been arrested and imprisoned in the citadel, where he will remain a prisoner until 1160.