This study examined the context of the Medieval Islamic qadi Ibn Taymiyyah in 14th century Bahri Mamluk Syria and Egypt and his incarcerations and death in prison by order of Sultan Nasser al-Muhammad Qalawun for ijtihad. This study demonstrated Ibn Taymiyyah practiced ijtihad, held the rank of mujtahid, and incurred the wrath of the Sultan. The evidence indicates that Taymiyyah’s independent reasoning held specific social, legal, and political threats to Qalawun, the Bahri Mamluk Sultan, during his third reign. The significant role Taymiyyah’s ijtihad played in the Sultan’s imprisonment calls for a review of previous scholarship emphasizing the role of jealousy by the religious elite and affection for Taymiyyah by the Sultan as significant factors in his conflicts. / Department of History