This is the fourth book in studying the reign of the Rightly Guided Caliphs. It relates the life of the Leader of the Believers, 'Ali, may Allah be pleased with him, from birth until his martyrdom. The book relates with detail how he came to Islam and his most important actions in Makkah, his migration to Madinah, his life in Madinah, his campaigns and battles alongside the Messenger of Allah, his life during the era of Rightly Guided Caliphs and his swearing of allegiance and his period of Caliphate.