Al-Hadi ila'l-Haqq Yahya, Arab religious and political leader (b. 859)
Abu'l-Ḥusayn Yaḥyā ibn al-Ḥusayn ibn al-Qāsim ibn Ibrāhīm al-Ḥasanī (al-Rass/Medina, 859 – Sa'dah, 18 August 911), better known by his honorific title of al-Ḥādī ila'l-Ḥaqq (Arabic: الهادي الى الحق, lit. 'the Guide to the Truth'), was a religious and political leader in the Arabian Peninsula. He was the first Zaydi imam who ruled portions of Yemen from 897 to 911. He is also the ancestor of the Rassid Dynasty which ruled Yemen intermittently until the North Yemen Civil War in 1962.