this title. Meanwhile, in southeastern Bulgaria, Mitso (a relative of Ivan Asen II) was proclaimed tsar, but the boyars who were holding Tărnovo elected one of their number, Constantine Tikh as tsar. Shortly afterwards, Rostislav led a large portion of his troops off to Bohemia in order to assist his father-in-law against King Ottokar II of Bohemia. Thus his Vidin province became undermanned, and the situation was ideal for Tsar Constantine Tikh who attacked the token forces left behind in Vidin and regained not only the city but the whole province to the borders of the province of Braničevo. As soon as the Hungarians concluded peace with the Bohemians in March 1261, they, led by Stephen V of Hungary (co-king and Rostislav's brother-in-law) attacked Bulgaria. They first overran the Vidin province and forced Tsar Constantine Tikh to withdraw his troops from it. As a result of Hungary's action, Rostislav was restored to the position he had held prior to Constantine Tikh's attack on him in 1260. Whether further Bulgarian territory east of Vidin (e.g., Lom) was taken by the Hungarians or Rostislav is not known. When he died, his lands were divided between two sons: his part of Bosnia went to his elder son Michael, while, Macsó went to his younger son, Béla; the immediate fate of Vidin is not known. Marriage and children In 1243, Rostislav married Anna of Hungary (c. 1226 – after 1274), daughter of King Béla IV of Hungary and his wife, Maria Laskarina. Together they had the following children: Duke Michael of Bosnia (? – 1271) Duke Béla of Macsó (? – November, 1272) Unnamed daughter (perhaps Anna), wife firstly of Tsar Michael Asen I of Bulgaria, secondly of Tsar Koloman II of Bulgaria Kunigunda (1245 – September 9, 1285), wife firstly of King Ottokar II of Bohemia, and secondly of nobleman Záviš of Falkenštejn (Rosenberg) Agrippina (? – May 26, 1303/1309), wife of Prince Leszek II of Cracow Ancestors Footnotes Sources Dimnik, Martin: The Dynasty of Chernigov - 1146-1246; Cambridge University Press, 2003, Cambridge; . Kristó, Gyula: Középkori históriák oklevelekben (1002-1410) (Medieval Stories in Royal Charters /1002-1410/); Szegedi Középkorász Műhely in association with the Gondolat Kiadó, 1992, Szeged; . Kristó, Gyula (General Editor) - Engel, Pál (Editor) - Makk, Ferenc (Editor): Korai magyar történeti lexikon (9-14. század) (Encyclopedia of the Early Hungarian History /9th-14th centuries/); Akadémiai Kiadó, 1994, Budapest; . Zsoldos, Attila: Családi ügy