Вацлав IV
Jan II took the full government over Oświęcim after his father's death on 29 September 1372. This was subsequently confirmed by the King Wenceslaus IV of Bohemia on 9 October of that year. The new Duke, however, had to accept named Przemysław I Noszak, Duke of Cieszyn his sole heir. In this case, was ignored the fact that Jan II had already a namesake son. Perhaps, just as in the case of Jan I, the future Jan III was originally destined for a Church career.