Abu'l-Qāsim al-Ḥasan ibn Faraj ibn Ḥawshab ibn Zādān al-Najjār al-Kūfī, better known simply as Ibn Ḥawshab, or by his honorific of Manṣūr al-Yaman, was a senior Isma'ili missionary from the environs of Kufa. In cooperation with Ali ibn al-Fadl al-Jayshani, he established the Isma'ili creed in Yemen and conquered much of that country in the 890s and 900s in the name of the Isma'ili imam, Abdallah al-Mahdi, who at the time was still in hiding. After al-Mahdi proclaimed himself publicly in Ifriqiya in 909 and established the Fatimid Caliphate, Ibn al-Fadl turned against him and forced Ibn Hawshab to a subordinate position. Ibn Hawshab's life is known from an autobiography he wrote, while later Isma'ili tradition ascribes two theological treatises to him.
Photo of Shibam (Kawkaban) today
Abd Allah al-Mahdi Billah
Abū Muḥammad ʿAbd Allāh ibn al-Ḥusayn, better known by his regnal name al-Mahdī biʾllāh, was the founder of the Isma'ili Fatimid Caliphate, the only major Shi'a caliphate in Islamic history, and the eleventh Imam of the Isma'ili branch of Shi'ism.
Remains of the northern gate of Sijilmasa
The Skifa Kahla, the landward gate of Mahdiya
Bulgarian emperor Simeon (left) sending envoys to Caliph al-Mahdi (right). 12th-century miniature from the Madrid Skylitzes