Anna

Anna , subsequently known under the religious name Anisia (Анисия), was the first wife of Tsar Ivan Asen II of Bulgaria (r. 1218–1241) and empress consort of the Second Bulgarian Empire from 1218 to 1221. She was exiled to a monastery in the beginning of Ivan Asen's reign, after he arranged his marriage to Anna Maria of Hungary. However, Bulgarian historian Ivan Bozhilov believes this to be a result of Akropolites' poor information.

Anna's actual time as empress was rather short-lived. Not long after taking the throne in 1218, Ivan Asen arranged his politically motivated marriage to Hungarian princess Anna Maria, daughter of King Andrew II (r. 1205–1235). Ivan Asen effectively demanded the marriage by prohibiting Andrew and his forces from passing through Bulgarian territory on their way back from the Fifth Crusade. After the future marriage of Ivan Asen and Anna Maria was settled, his first wife Anna was retired to a monastery and became a nun under the name Anisia. Another daughter of Anna, tentatively known as Beloslava, was married to Serbian king Stephen Vladislav I (r. 1234–1243).