Jan II the Mad also known as the Bad, the Wild or the Cruel, was a Duke of Żagań-Przewóz since 1439, from 1449 Duke of Przewóz, during 1461–1468 and briefly in 1472 Duke of Żagań and during 1476–1488 Duke of half-Głogów.

Świebodzin is a town in western Poland with 21,736 inhabitants (2019). It is the capital of Świebodzin County. Since the Local Government Reorganization Act of 1998, Świebodzin has been part of Lubusz Voivodeship. It was formerly part of the Zielona Góra Voivodeship (1975–1998).