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In page Chojnów:

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The town is first mentioned in a Latin mediaeval document issued in Wrocław on February 26, 1253, stating, the Silesian Duke Henry III when the town is mentioned under the name Honowo.[1][2] Possible the name of nearby Hainau Island.[citation needed] The name is of Polish origin, and in more modern records from the 19th century, the Polish name appears as Hajnów,[3][4] while Haynau is the Germanized version of the original Polish name.[5]