Ḥujr ibn ʿAdī was a prominent companion of Prophet Muhammad (s.a.w.w.) and one of the most loyal supporters of Imam Ali (a.s.). He was renowned for his bravery, deep knowledge, and unshakable devotion to the principles of Islam. After the Prophet's passing, Ḥujr continued to support Imam Ali, playing an instrumental role in key battles, including Siffin. His unwavering stance against the unjust Umayyad rule, particularly under Muawiya, led to his eventual arrest and execution. His death is remembered as an act of martyrdom, highlighting the brutal persecution faced by the followers of Ahlul Bayt in early Islamic history. This book examines the circumstances of his life and death, reflecting on the larger implications of political tyranny and religious persecution during the Umayyad era.