sentences:  In 1521 the Duchy of Racibórz ("Ratibor") was inherited by the Duchy of Opole, by then also known by its German equivalent – Oppeln.The second castle of Opole was probably founded in the 14th century by duke Vladislaus II, though some sources claim that it was originally a wooden stronghold of Opole's castellan dating into 12th century.With the death of King Ludvík II of Bohemia at the Battle of Mohács, Silesia was inherited by Ferdinand I, placing Opole under the sovereignty of the Habsburg Monarchy of Austria.