In 1497, after the death of Nicholas II, Niemodlin was inherited by Jan II, in 1498 was bought Bytom, and the Świerklaniec castle with his privileges, and finally in 1509 was annexed Koźle.
The settlement between King George and Nicholas I was signed on 16 August 1460: the King finally accepted the rule of the Duke of Opole over Strzelce, Niemodlin and Olesno, but in exchange Nicholas I had to resign his claims over the Duchy of Opawa (he bought the Duchy in 1454 from his co-ruler Ernest, but as a result of the King's strong opposition, Nicholas I wasn't able to take effective control over this land).