Ali ibn Muhammad ibn ‘Ali (; 828-868
C.E. ) commonly called
Ali al-Hadi and
Ali an-Naqi was known as
al-Hadi. He was the tenth of
the Twelve Imams after his father
Muhammad al-Jawad and before his son
Hasan al-Askari. He remained in
Medina teaching until the age of 30 when he was summoned to
Samarra by the
Abbasid caliph Al-Mutawakkil. There he was treated roughly by the caliph and his successors until, according to Shiite accounts, he was poisoned through intrigue of
Al-Mu'tazz the Abbasid caliph, in 254/868, and was buried in Samarra.