[1] However, the fictional descent from Jochi's son Orda found in older literature continues to be cited in many works.
When Mengu-Timur ruled the Golden Horde, he gave Tuqa-Timur's son Urung-Timur (also called Uz-Timur and Urungbash) lands in the Crimea, which were retained by his descendants.
One of these victims was his cousin Tuy Khwaja, the father of the future Khan Tokhtamysh, which caused the implacable enmity of the latter toward Urus and his sons.
He chased out the beglerbeg Mamai's protégé Muḥammad-Sulṭān in 1373 and appears to have briefly held the city, before losing it almost immediately to a local ruler, Ḥājjī Cherkes of Astrakhan, and then the Shibanid Īl Beg.
Urus' son Qutlu-Buqa, who was governing the east in his father's absence attacked and expelled Tokhtamysh, who sought refuge with Timur again.
[9][7] The stage was now set for a major confrontation between Urus, who had temporarily given up on his ambition to hold Sarai, and Timur, who insisted on protecting and supporting Tokhtamysh.
Bad weather delayed the impending engagement and, despite some skirmishes (in which Urus' son Timur-Malik was wounded), no decisive battle ensued.
Urus had reigned for nine years, but his attempts to hold Sarai and take over the western portions of the Golden Horde had met with failure.
[11] Urus had four sons who played a political role: Qutlu-Buqa, who governed in the east while Urus attempted to take over Sarai but predeceased his father; Toqtaqiya, who succeeded his father but died after two months; Timur-Malik, who succeeded his brother but was overthrown by his cousin Tokhtamysh; and Quyurchuq, who challenged Tokhtamysh for control of the Golden Horde in 1395–1397.