Fateh Daud was the Ismaili Shi'a ruler of Multan. He was deposed by Mahmud of Ghazni, who also massacred the Ismailis in the course of his conquest of Multan.
The Ismaili ruler of Multan fled to a fort where he immured himself and was finally pardoned by Sultan Mahmud Ghaznavi on promise of payment of ransom. Abul Fatah Daud offered a yearly tribute of 200,000 golden Dirhams and conversion from Shia Isma'ili fiqh to Sunni Hanafi fiqh. The terms were accepted, and Sultan Mahmud Ghaznavi also exacted 2 million dirhams from the population of Multan by force.
"Despite the hostilities of the Ghaznavids and their successors , Ismailism survived in Sindh and later received the protection of the Sumras, who ruled independently from Thatta, for almost three centuries starting 1051 AD."