Euphrosyne (died before 1308) was Bulgarian empress consort (tsarina), first wife of tzar Theodore Svetoslav of Bulgaria.
She was the daughter and heiress of the rich Manux[1] (Mankus[citation needed]), who was a son of Pandoleon, a Byzantine merchant from Crimea[2] and a close friend of Nogai Khan,[1] the effective leader of the Mongol Golden Horde.
The regency for Ivan II fled Tarnovo in 1299, and the gold of Theodore Svetoslav's wife convinced the Bulgarian nobility to open the city gate[1] and to accept Chaka as ruler.
Theodore Svetoslav now became emperor of Bulgaria and sent Chaka's severed head as a present to Toqta, who withdrew his armies from the country.
According to the Bulgaria historian Plamen Pavlov, at this time Euphrosyne was the first crowned woman in Medieval Europe, who belonged to the third estate.