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Other owners of the town also expanded the small castle, the most notable of them being Prince Michał Gliński, Mikołaj Radziwiłł and Zygmunt August, the future king of Poland.
In 1557, local nobleman Spytek Wawrzyniec Jordan of Trąby coat of arms (the owner of Melsztyn) purchased Opatkowice from the Tyniec Abbey, and on July 17, 1557 in Vilnius, King Zygmunt August allowed Jordan to establish a Magdeburg rights town, located at the foot of the Melsztyn Castle, on the right bank of the Dunajec, in the location of the village of Opatkowice.