During the short reign of his young son Alp Arslan al-Akhras, who ceded the Balis fortress on the Aleppo–Baghdad road to Abu Tahir. During his anti-Nizari campaign, the Seljuq sultan Muhammad I Tapar sent Sa'id ibn Badi', the rais of Aleppo, to turn Alp Arslan against the Nizaris. Abu Tahir and many other Nizaris in Aleppo were subsequently executed and others dispersed or went underground.[3]