After the conquest of Syria and northern Iraq, Saladin named al-Muzaffar Umar the sovereign of Ayyubid-ruled Mesopotamia. In the city of Edessa located in the Mesopotamian territory, al-Muzaffar Umar also built a madrasa. He particularly showed favor for those who worked in religious law and the Sufis. He was handed the principality of Hama four years after helping Saladin conquer it in 1175. His ascendancy ushered in an era of prosperity for Hama that lasted until the end of Ayyubid rule in 1341. During al-Muzaffar Umar's reign, the city was walled, and palaces, markets, madrasas, and mosques were built.
Viceroy of Egypt
In 1181, while in Manbij, he attempted to block the Zengid forces of Izz ad-Din Mas'ud from reaching Aleppo, but failed and was forced to retreat to Hama. Two years later, Saladin's brother and his deputy ruler in Egypt, al-Adil, was sent to besiege Kerak in southern Transjordan which was in Crusader hands. Saladin therefore sent al-Muzaffar Umar as al-Adil's replacement. While in Egypt, he was granted the province of Fayyum as a fief. He founded two Sunni Muslimmadrasas in the province, one for the Shafi'i denomination and the other for the Maliki denomination. In Cairo, he erected a madrasa bearing the name Manazil al-Izz which was a former residence of his—originally taken from the Fatimids. All of his Egyptian properties were made a part of his waqf. However, in 1185, Saladin appointed his son, al-Aziz Uthman, to rule Egypt on his behalf.
Return to Syria
This act upset al-Muzaffar Umar who resolved to invade the Maghreb, but was discouraged from doing so by his aides. He acceded to Saladin's request that he return to serve as an army commander under his authority. The two met near Damascus and al-Muzaffar Umar was graciously welcomed by his uncle. Later, in 1187, al-Muzaffar Umar participated in the Battle of Hattin, where he proved instrumental in the decisive Ayyubid victory over the Crusader armies. Afterward, he returned to Hama, and soon after he led his forces to Khilat in Mesopotamia with the intention of capturing the Seljuk-held castle of Manzikert. The siege continued for weeks and al-Muzaffar Umar died while it was in effect on October 19, 1191. His body was transported to Hama where it was buried. His son Al-Mansur Muhammad was appointed his successor and al-Muzaffar Umar's descendants would end up ruling Hama until being deposed by the Mamluks in 1341. Baha ad-Din ibn Shaddad witnessed how Saladin and his commanders Ibn Jender, Sabek ad-Din and Izz ad-din broke into tears when they received a letter confirming the death of Al-Muzaffar Umar, he died on Friday 19th of Ramadan.
Legacy
Al-Muzaffar Umar's sons Zein ad-Din and Al-Malik Al-Mansur continued to serve Saladin with the utmost loyalty. In fact Zein ad-Din is known to have punished the renegade Ibn Kafjak for massacring the population of Urumiah in his attempts to foment an internal struggle among the Muslim ranks instead of placing him in the dungeons of Al-Kerkhani. Al-Malik Al-Mansur succeeded his father as Emir of Hama.
