Abu'l-Fath an-Nasir ad-Dailami (died 1053) was an imam of the Zaidi state in Yemen who ruled from c. 1038 to 1053.
[1] He was born and raised in Deylaman south of the Caspian Sea where there was also a Zaydiyyah congregation, hence his cognomen ad-Dailami.
The new ruler set out to organize the Yemeni highland, appointing officials and collecting land taxes and zakat.
In 1047 several further highland groups submitted to Abu'l-Fath, including the emir Ja'far, brother of imam al-Mahdi al-Husayn and leader of the Husayniyya Zaidi sect.
The slain imam was buried in Radman in the Ans region, and his grave was subsequently the object of veneration by pilgrims.