Caliph Al-Hasan ibn ‘Ali is the grandson of which Islamic prophet?
Mujtaba Al-Mujtaba (Arabic: اَلْـمُـجْـتَـبَى‎ ‎ ) is an Arabic word which means "The Selected One" or "The Chosen One among many." It is a title of the Islamic "Nabi" (Arabic: نَـبِي‎ ‎ , Prophet) Muhammad, and his grandson, the Caliph Al-Hasan ibn ‘Ali.
Al-Mahdi Abdallah Al-Mahdi Abdallah (1793 - 28 November 1835) was an Imam of Yemen who ruled from 1816 to 1835. He belonged to the Qasimid family, who were descendants of the Prophet Muhammad. From 1597 to 1962, the Qasimids dominated the Zaidi imamate of Yemen.