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.
Shia view of Ali Ali was the cousin and son-in-law of the Islamic prophet Muhammad, and a member of the "Ahl al-Bayt". Shias regard Ali as the first Imam and is considered, along with his descendants, to be one of the divinely appointed successors of Muhammad who are claimed by the Shia the only legitimate religious and political leaders of the Muslim community. Although Ali was regarded, during the lifetime of Muhammad, as his initial successor, it would be 25 years before he was recognized with the title of Caliph "(successor)". Like the rest of his household, Shias claim that Ali is infallible and sinless and is one of The Fourteen Infallibles of the household of Muhammed.