He was co-ruler of the Duchy of Opava from 1445/1457 to 1464 and of the Duchy of Głubczyce from 1445/1457 until his death. John I died in 1464 and John II inherited his title of Lord of Fulnek. In 1451, William transferred his claim on the Duchy of Münsterberg to Ernest and received Ernest"s third of Opava in return.
Thus, William owned a two-third share of Opava.
However, William died the following year and Ernest, acting as guardian for William"s underage sons, sold this share to Duke Bolko V of Opole. Bolko V died in 1460, and his share of Opava fell to King George of Bohemia as a completed fief.
In 1464, John II sold his one-third share to George, who thereby came into full possession of Opava, thus considerably expanding his sphere of influence. In the armed conflict about George"s succession, John II initially supported Vladislaus World War II After Matthias Corvinus conquered Silesia in 1479, John II paid him homage.
In 1480, he founded a Franciscan monastery in Głubczyce.
John II was married to a Catherine of unknown descent. She died without issue in 1485. His nickname "the Pious" allegedly refers to the fact that he didn"t remarry after her death.
John II died c. 1485.
With his death the main Opava line of the Přemyslid dynasty died out, although the Opava-Ratibor line continued to exist until 1521. The Duchy of Głubczyce fell to King Matthis as a completed fief.