Mieszko's small share was enlarged the first time in 1177, when he received the territories of Bytom, Oświęcim, Zator, Pszczyna and Siewierz from his uncle High Duke Casimir II the Just of Poland.Racibórz at that time comprised the lands of Wodzisław, Żory, Rybnik, Mikołów and Pszczyna, while some of the territory of was used for the creation of the duchies of Cieszyn and Bytom under Przemysław's brothers.A large number of place names of German origin in the southern part of the Duchy are the effect of medieval Ostsiedlung.[1] In 1327 Przemysław's son Duke Leszek paid homage to King John of Bohemia, whereafter his duchy became a Bohemian fief.King Frederick William IV of Prussia in 1840 granted it to the landgrave's nephew Prince Victor of Hohenlohe-Schillingsfürst, in turn for his renunciation of the Hohenlohe inheritance in favour of his younger brother Chlodwig.
Arms of the Dukes of Ratibor and Princes of Corvey