Зембицкое княжество
In 1542, Joachim and his brothers pledged the heavily indebted Duchy of Münsterberg to their uncle Duke Frederick II of Legnica. That same year, the other possessions were divided: Henry II received the Duchy of Bernstadt, Joachim, the oldest of the brothers became Bishop of Brandenburg, while John continued the government in the Duchy of Oels. There he led the rebuilding of the castle into a Renaissance castle and the construction of a four storey Front Castle that would be used as Wittum.