sentences:  In 1281 Upper Silesia was divided further between the heirs of the dukes.The Duchy of Opole was temporarily reestablished in 1290.In the early 13th century, Duke Casimir I of Opole decided to move the settlement from the Pasieka Island into the right shore of the Oder river (since the 17th century it is the old stream bed of Oder known as Młynówka).