Chaka of Bulgaria

Chaka (died 1300) was a Mongol prince, son of the Golden Horde strongman Nogai Khan. In the late 1290s he fought with his father against Khan Toqta, who defeated and killed Nogai in 1299. Chaka then led his followers into Bulgaria, drove out Ivan II's regency, and ruled at Tarnovo in 1299–1300.

Toqta's army pursued him and besieged the capital; his brother-in-law Theodore Svetoslav plotted against him, had him strangled in prison, and sent his head to the khan.