 Complete the following phrase:  Persons of CumanKipchak origin also became Mamluk leaders: a prominent Cuman Sultan of the Egyptian Mamluk Sultanate, Sultan Baibars reigned 12601277, defeated King Louis IX of France, and resisted the Mongol invasion, defeating the Mongol army at the Battle of Ain Jalut 1260 and the Battle of Elbistan 1277 by using the feigned-retreat tactic. Mamluks in the empire retained a particularly strong sense of Cuman identity, to the degree that the biography of Sultan Baibars, as reflected by Ibn Shaddad, focused on his birth and early years in Desht-i-Kipchak Steppe of the KipchaksCumania, as well as enslavement and subsequent travels to Bulgaria and the Near East. The historian Dimitri Korobeinikov relates how Baibars story sums up the tragic fate of many Cumans after the 