Abul Hasan Ali ibn Muhammad al-Samarri
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In Twelver Shia Islam, Uthman ibn Sa'id al-Asadi was the fourth and last of The Four Deputies appointed by the twelfth and final Imam, Muhammad al-Mahdi, while he was in the Minor Occultation. After he passed away unlike his predecessors he did not appoint a successor, and the Major Occultation began.

