

A child Imam whose spiritual authority, accepted by followers despite his youth, shaped the theological foundations of Twelver Shi'ism.
Born in Medina in 828, Ali al-Hadi inherited a mantle of immense spiritual responsibility at the age of six or seven, following the death of his father, Imam Muhammad al-Jawad. His early succession tested the community's faith, with Twelver sources drawing upon Quranic narratives to affirm that divine wisdom could manifest through a child. Much of his life was spent under the watchful and restrictive eye of the Abbasid caliphate, which moved him from Medina to Samarra, Iraq, where he lived in a state of enforced residence for the remainder of his life. This period of relative isolation, lasting over two decades, did not diminish his role as a guide; he cultivated a network of representatives and deepened the theological and legal discourse of his followers through correspondence and clandestine meetings. His death in 868, possibly by poisoning ordered by the caliph, marked the beginning of the Minor Occultation, a pivotal era where his young son succeeded him and direct contact with the Imam gradually ceased. Al-Hadi's imamate, defined by political constraint and profound religious stewardship, solidified the line of the Twelve and the community's resilience under pressure.
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He is known by the titles al-Hadi (the guide) and al-Naqi (the pure).
The mosque containing his shrine in Samarra, along with his son's, was bombed in 2006, severely damaging its golden dome.
Some accounts suggest he was a skilled calligrapher.
His period in Samarra is sometimes referred to as 'al-'Askar' because he lived in a military cantonment area.
“Knowledge is a light placed by God in the hearts of his chosen servants.”