Asad ad-Dīn Shīrkūh bin Shādhī (; ), also known as Shirkuh, or Şêrko (meaning "lion of the mountains" in Kurdish) (died 22 February 1169) was a Kurdish military commander, and uncle of Saladin. His military and diplomatic efforts in Egypt were a key factor in establishing the Ayyubid dynasty in that country. Name Shirkuh is a Kurdish name which literally means "the lion (of the) mountain". Shirkuh is also the name of several villages in modern-day Iran. His Arabic honorific Asad ad-Din similarly means "the lion of faith". In Latin, his name was rendered as "Siraconus"; William of Tyre, referring to the expedition of 1163, describes him as: an able and energetic warrior, eager for glory and of wide experience in military affairs. Generous far beyond the resources of his patrimony, Shirkuh was beloved by his followers because of this munificence. He was small of stature, very stout and fat and already advanced in years. Though of lowly origin, he had become rich and risen by merit from his humble estate to the rank of prince. He was afflicted with cataract in one eye. He was a man of great endurance under hardships, one who bore hunger and thirst with an equanimity quite unusual for that time of life. Origins and earlier career He was originally from a Kurdish village in Armenia near the town of Dvin. He was the son of Shadhi ibn Marwan, a Kurdish chief, and the brother of Najm ad-Din Ayyub, the ancestor of the Ayyubid dynasty. The family was closely connected to the Shaddadid dynasty, and when the last Shaddadid was deposed in Dvin in 1130, Shahdi moved the family first to Baghdad and then to Tikrit, where he was appointed governor by the regional administrator Bihruz. Ayyub succeeded his father as governor of Tikrit when Shahdi died soon after. When Shirkuh killed a Christian with whom he was quarrelling in Tikrit in 1138, the brothers were exiled (Shirkuh's nephew Yusuf, later known as Saladin, was supposedly born the night they left). They joined Nur ad-Din Zengi's army, and Shirkuh served under Nur ad-Din Zengi who succeeded Zengi in Mosul. Shirkuh was later given Homs, ar-Rahba and other appanages by Nur ad Din Zengi as his vassal. Ayyub served as governor of Baalbek and later Damascus, and the two brothers negotiated the surrender of Damascus to Nur ad-Din in 1154. In 1163 Nur ad-Din was