al-Mahdī Muḥammad b. Aḥmad b. al-Ḥasan b. al-Qāsim (r. 1097–1130/1686–1718)—widely known as Ṣāḥib al-Mawāhib (“Lord of al-Mawāhib”)—was Imām and ruler of the Qāsimī line (c.1000–1382/c.1592–1962) of Zaydī Shīʿī Imāms in Yemen. He was the great-grandson of the founder of that line, Imām al-Manṣūr bi-llāh al-Qāsim b. Muḥammad (r. 1006–29/1597–1620). The wars of succession preceding his rule have been compared by modern scholars to the wars between the amīrs of the rival principalities in al-Andalus (mulūk al-ṭawāʾif) following the collapse of the Umayyad caliphate of Cór…