Triune Kingdom
The Triune Kingdom (Croatian: Trojedna kraljevina) or Triune Kingdom of Croatia, Slavonia and Dalmatia (Croatian: Trojedna Kraljevina Hrvatske, Slavonije i Dalmacije) was the concept—advocated by the leaders of the 19th-century Croatian national revival—of a united kingdom between Croatia, Slavonia and Dalmatia, which were already within the Austrian Empire under one king, who was also the Emperor of Austria, but were politically and administratively separate entities. This concept had roots in the high medieval period, as a successor to the historical Kingdom of Croatia which was made up of those regions.