Wenceslaus IV of Bohemia
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.