Abūʾl-Ḥusayn Yaḥyā ibn al-Ḥusayn ibn al-Qāsim ibn Ibrāhīm al-Ḥasanī, better known by his honorific title of al-Hādī ilāʾl-Ḥaqq, 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.

Saada, a city and ancient capital in the northwest of Yemen, is the capital and largest city of the governorate of the same name, and the seat of the eponymous district. The city is located in the mountains of Serat (Sarawat) at an altitude of about 1,800 meters. In 2004, it was the tenth-largest city in Yemen and had an estimated population of 51,870.