Kostopil (Ukrainian: Косто́піль, Polish: Kostopol) is a small city on the Zamchysko river in Rivne Oblast, western Ukraine (historical Volhynia). It was the administrative center of the Kostopil Raion up to 2020, but is now within the Rivne Raion. Population: 30,838 (2022 est.). Kostopil was the property of Prince Władysław Dominik Zasławski and is mentioned in 1648-58 registers. It was originally a village based on a local iron mine, but in 1792 the local landowner, Leonard Wortzel, obtained town privileges for his estate including the right for an annual fair from Stanisław August Poniatowski, the last King of the Polish–Lithuanian Commonwealth. At this time Wortzel changed the town's name to Kostopol. More information...
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