History
One of the counties in the Kingdom of Croatia-Slavonia (an autonomous kingdom within the Hungarian part of Austria-Hungary) was named Modruš-Rijeka County, partially after the town.
The fortress may have already existed in 1209. The town around it developed during the 14th and 15th centuries.
From 1193 until 1553, Modruš and the large surrounding estate was owned by members of the Frankopan noble family, who were living in the Tržan castle above the medieval settlement.
In 1460, Modruš became the seat of the Roman Catholic Diocese of Krbava-Modruš.
Modruš was mentioned on 22 February 1481, in a document freeing the citizens of Grič from tariffs, in Modruš and elsewhere.
In 1553, Modruš came under the administration of the Military Frontier authorities.
At 13:00 on 22 June 1942, a Partisan attack was carried out from Deriguz on Modruš. The forester Josip Rendulić was wounded at Deriguz and transported to Sisak. But the attack was repelled.
Demographics
In 1895, the obćina of Modruš (court at Modruš Gornji), with an area of 109 square kilometres (42 mi2), belonged to the kotar of Ogulin (Ogulin court but Plaški electoral district) in the županija of Modruš-Rieka (Ogulin high court and financial board). There were 520 houses, with a population of 3879. Its 14 villages and 39 hamlets were divided for taxation purposes into 2 porezne obćine, under the Ogulin office.: iv, v
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