Chaka (in Bulgarian: Чака) reigned as emperor (tsar) of Bulgaria from 1299 to 1300. The date of his birth is unknown.
Chaka was the son of Mongol leader Nogai Khan with a woman named Alaka. Some time after 1285 Chaka married a daughter of unknown name of Jorge I Terter of Bulgaria. At the end of 1290, Chaka supported his father Nogai in a war against the legitimate khan of the Golden Horde Toqta, but Toqta was victorious and defeated and killed Nogai in 1299.
Almost at the same time Chaka had taken his followers to Bulgaria, intimidated the regency of Ivan II by making him flee the capital, and imposed himself as ruler in Tarnovo in 1299. It is not entirely certain that he reigned as Emperor of Bulgaria or simply act as the supreme leader of his brother-in-law Theodore Svetoslav. In any case he is accepted as Bulgarian ruler by Bulgarian historiography.
Chaka did not last long in enjoying his new position of power, as Toqta's armies followed him to Bulgaria and besieged Tarnovo. Theodore Svetoslav, who had been instrumental in helping Chaka take power, organized a plot in which Chaka was deposed and strangled in prison in 1300. His head was sent to Toqta, who in turn secured the position of Theodore Svetoslav as the new emperor of Bulgaria. It seems that the cooperation of Theodore Svetoslav contributed to the withdrawal of Mongol interference in Bulgaria.
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