We present to our readers the fourth book in the “History of the Caliphate” series. It is dedicated to the fourth righteous caliph 'Ali ibn Abu Talib and tells about his life from birth to death. If Abu Bakr was a man of gentle disposition, distinguished by his determination, 'Umar was demanding and unpretentious, and 'Uthman was diplomatic and sought to achieve agreement, then Ali was distinguished, first of all, by a deep understanding of religion, an ascetic lifestyle and the fearlessness of a true warrior. It also tells about the features of his state, which he ruled in accordance with the Book of Allah and the Sunnah of His Messenger, following the example of his predecessors - the righteous caliphs. The material collected in this book allows the reader to find out the truth about the events of those years and get a correct idea about them and about the personalities , who happened to become participants in these important, turning-point events in the history of Islam and the Islamic state. In his research, the author tried to shed light on the era of the fourth righteous caliph, using reliable reports and stories, so that we can learn lessons and draw useful conclusions from the events of that era and join in the knowledge that this unique era was a treasury of. those who are interested not only in the personality of the fourth righteous caliph Ali ibn Abu Talib, but also in the historical era in which he lived.