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He became Emir of Mosul in 1170 after the death of his father Qutb ad-Din Mawdud. Saif had been chosen as the successor under the advice of eunuch ’Abd al-Masish, who wanted to keep the effective rule in lieu of the young emir; the disinherited son of Mawdud, Imad ad-Din Zengi II, fled to Aleppo at the court of Nur ad-Din. The latter, who was waiting for an excuse to annex Mosul, conquered Sinjar in September 1170 and besieged Mosul, which surrendered on 22 January 1171. After ousting al-Masish, he put Gümüshtekin, one of his officers, as governor, leaving Saif ud-Din nothing but the nominal title of emir. The latter also married the daughter of Nur ad-Din.