Dorothea of Bulgaria (Bulgarian: Доротея, Serbo-Croatian: Doroteja, Доротеја; died c. 1390), also called Doroslava (Cyrillic: Дорослава), was the first Queen of Bosnia.
Daughter of the Bulgarian tsar Ivan Sratsimir, Dorothea was held hostage by King Louis I of Hungary, who married her off to Ban Tvrtko I of Bosnia in 1374.
Dorothea was captured along with her parents and sister in 1365 by the army of King Louis I of Hungary following his conquest of Ivan Sratsimir's capital city, Vidin.
[3][6] Ban Tvrtko I of Bosnia, another vassal of King Louis, probably first heard about Dorothea during her captivity in Croatia.
She witnessed her husband's charters and took oaths to respect them, initially alongside her mother-in-law, Jelena Šubić.