Herzogtum Oppeln
The Duchy of Racibórz under Duke Mieszko Tanglefoot had been established in 1173 upon the partition of Silesia among the sons of Duke Władysław II the Exile. The bulk of the Silesian lands around Wrocław had passed to Mieszko's elder brother Duke Bolesław I the Tall, leaving the younger dissatisfied. After Bolesław had died in 1201, Mieszko occupied the Duchy of Opole, that had been created for his deceased nephew Jarosław, forming the united duchy of Opole and Racibórz. Bolesław's heir, Duke Henry I the Bearded, had to renounce his claims, whereby the centuries-long division of Upper and Lower Silesia was fixed.