 Margarita Gómez-Acebo y Cejuela, the wife of Simeon II of Bulgaria, is also sometimes referred as a tsarina.The first Serbian tsarina was Helena of Bulgaria, sister of Bulgarian Tsar Ivan Alexander and wife of Tsar Stephen Uroš IV Dušan of Serbia.She was the empress consort of Serbia from 1346 until Dušan's sudden death in 1355.