This book narrates the biography of Umar ibn al-Khattab, the second of the Rightly-Guided Caliphs, whose life marked a turning point in Islamic history. The book begins by reviewing the stages of Umar's life during the pre-Islamic era, highlighting his standing among his people and the strength of his personality that paved the way for his great transformation upon embracing Islam. It discusses in detail the moment of his conversion to Islam and how he became a pillar of the Islamic call, accompanying the Prophet Muhammad (peace and blessings be upon him) throughout the various stages of his mission. It also examines Umar's role during the caliphate of Abu Bakr al-Siddiq, where he played a strong role in making crucial decisions. Upon assuming the caliphate, the book highlights how he began his reign with justice and firmness, establishing an administrative and organizational system that contributed to the stability of the Islamic state. The author delves into the details of the great conquests during Umar's reign, beginning with the conquest of Damascus and the liberation of Jordan, moving on to al-Qadisiyyah and al-Mada'in, and finally the conquest of Egypt and Alexandria. The book explains how Omar managed to eliminate the Persian Empire, expand the country's borders, and consolidate Islamic rule in the Levant, Iraq, and Egypt. It also covers social life during his era, from organizing markets and managing crises to his jurisprudential efforts, which reflect his insightful vision and sense of responsibility. It also covers his handling of crises such as famine and epidemics, demonstrating his wisdom in dealing with these hardships.