Ibn al-Athir

Izz ad-Din Ali ibn al-Athir (555-630 AH / 1160-1233 CE) was one of the greatest historians of the Islamic world and the author of al-Kamil fi at-Tarikh (The Complete in History), a comprehensive annalistic history spanning from the beginning of creation to his own time. Born in Jazirat ibn Umar (in present-day southeastern Turkey), he was the middle brother of the three famous Ibn al-Athir scholars. He studied in Mosul and traveled to Baghdad, Damascus, and Jerusalem.

Al-Kamil fi at-Tarikh is considered the most important universal history produced in the medieval Islamic world after at-Tabari's Tarikh. It covers events year by year with remarkable detail and analytical insight, and it is particularly valuable for the period from the Crusades through the Mongol invasions, events that Ibn al-Athir witnessed or learned about from eyewitnesses. His account of the fall of Jerusalem, the campaigns of Salah ad-Din, and the devastation wrought by the Mongols under Genghis Khan are among the most important primary sources for these events. He also authored Usd al-Ghabah fi Marifat as-Sahabah (Lions of the Forest in Knowledge of the Companions), a major biographical dictionary of over 7,500 Companions of the Prophet.

Ibn al-Athir was known for his clear prose style, his ability to synthesize multiple sources into coherent narratives, and his balanced historical judgment. He died in Mosul in 630 AH (1233 CE). His al-Kamil remains an essential source for the study of Islamic history, particularly for the Crusader, Zangid, Ayyubid, and early Mongol periods.