In what year did the line from which Premyslaw II come from become extinct?
Przemysław II, Duke of Cieszyn:  von Teschen ; 1422/25 – 18 March 1477), was a Duke of Cieszyn (Teschen, Těšín) from 1431, ruler over Bielsko and Skoczów (from 1442), Duke of half of both Duchy of Głogów (Glogau, Hlohov) and Duchy of Ścinawa from 1460 and from 1468 sole ruler over Cieszyn.
i don't know