Kingdom of Slavonia
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The Kingdom of Slavonia was a province of the Habsburg Monarchy in the 18th and 19th century as one of the Lands of the Crown of St. Stephen. The province included northern parts of present-day regions of Slavonia (today in Croatia) and Syrmia (today in Serbia and Croatia). The southern parts of these regions were part of the Habsburg Military Frontier (Slavonian Krajina).
The Kingdom of Slavonia was formed in 1745 and it belonged to both, the Kingdom of Croatia, and the Kingdom of Hungary. After 1849, both, Kingdom of Slavonia and Kingdom of Croatia were affirmed as a completely separate Habsburg crown lands. Following the 1868 Settlement (hrvatsko-ugarska nagodba) with the Kingdom of Hungary, Kingdom of Slavonia was joined with Kingdom of Croatia into the single Croatia-Slavonia kingdom, which although it was under the suzerainty of the Crown of Saint Stephen kept a certain level of self-rule.