Maria of Bulgaria was the second empress consort of Henry of Flanders, Latin Emperor of Constantinople.
Her mother may have been his wife Anna of Cumania, who went on to marry Boril of Bulgaria, a nephew of her first husband.
Fine, the marriage was part of an alliance between her stepfather Boril and Henry.
On the other hand, Boril had suffered losses in both men and territory while the war continued.
Their marriage was childless and Henry was succeeded by his brother-in-law Peter II of Courtenay.