Modruš-Rijeka County

Croatia-Slavonia was an autonomous kingdom within the Lands of the Crown of Saint Stephen (Transleithania), the Hungarian part of the dual Austro-Hungarian Empire.

Modruš is a small town near Ogulin; Rijeka (then officially Fiume) is a large city on the Adriatic coast.

In the decade following the 1848 revolutions Fiume formed part of the autonomous Kingdom of Croatia, becoming the seat of the new Fiume/Rijeka County.

Ogulin-Slunj County was formed from the merger of the former districts of the Ogulin (III) and Slunj (IV) regiments.

In October 1918 Croatia-Slavonia seceded from Austria-Hungary as part of the State of Slovenes, Croats and Serbs, which de facto merged with the Kingdom of Serbia to form the Kingdom of Serbs, Croats, and Slovenes (later renamed to Yugoslavia) that December; this was formally recognised in 1920 by the Treaty of Trianon.

An 1885 map showing Croatia-Slavonia and south-western Hungary before the final restructuring of the Croatian-Slavonian counties. Fiume County (pale blue) and Ogulin-Slunj County (peach) can be seen in the far left.