Their property stretched to the border with Kranjska (Carniola), inside it they built new settlements, developed trade and economic activities. In the 16th century the Frankopans were followed by the Zrinskis, who based their economy on the exploitation of natural resources. During the 15th and 16th centuries the Ottomans took over a great number of the Frankopans’ properties in Gorski Kotar, and almost half of the population moved away. Stjepan Frankopan, the last male descendant of the Ozalj branch, signed an agreement with Nikola Šubić Zrinski, the husband of his sister Katarina, by which the inheritance of the Frankopans of Ozalj passed into the hands of the descendants of Nikola and Katarina. Their great-grandsons Nikola and Petar Zrinski, who with Fran Krsto Frankopan took part in the Zrinski-Frankopan Conspiracy, administered most of their manors. Gorski Kotar, together with the Primorje coastal region, came into the possession of the Counts of Zrinski in the Banovina of Croatia region, where it remained until the executions of Fran Krsto Frankopan and Petar Zrinski in 1671.
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