Brzeg

Brzeg was a Silesian Piast duchy on the Oder, centred on the town of Brzeg. In 1337 Bolesław III the Generous ruled it as a vassal of King John of Bohemia.

A 1537 treaty promised Brzeg to Brandenburg's Hohenzollerns if the Piast line died out, but the Bohemian king rejected it. When the last Piast, George William, died in 1675, the Habsburgs took control. Frederick II of Prussia later invoked the disputed treaty, and Brzeg passed to Prussia in 1742.