In 1391, he gave the villages of Imielin, Kosztowy and Chełm Śląski on the eastern border of his duchy to the Bishop of Krakow.

The village of Halemba near Ruda Śląska developed from an iron works founded by his brother Nicholas IV in 1394.

In 1394, John II founded another iron works, named German: Bogutzker Hammer, on the spot of the deserted village of Bogucice.

In 1389, the bishops of Wrocław and Olomouc and the Dukes of Legnica, Oleśnica, Głogów, Opava and Teschen formed and alliance for mutual protection and to preserve the public peace.

John II was high steward of King Wenceslaus IV and this made him one of the most powerful men in the Kingdom of Bohemia.

In 1397, John II and other noble councillors accused Wenceslaus IV of neglecting his duties as King of the Romans and asked him to summon an Imperial Diet.

After Wenceslaus's death, John II supported his successor, King Sigismund, and paid him homage in Wrocław in 1420 during the Imperial Diet.

When they traveled through Ratibor on 21 September 1421, they were arrested by the citizens and John II handed them over to King Sigismund.