The Bobrzanie are one of the Silesian tribes
Silesian tribes
Silesian tribes – are the European tribes of West Slavs that lived in the territories of Silesia. The territory they lived on became part of the Great Moravia in 875 and later, in 990, first Polish state created by duke Mieszko I and then expanded by king Boleslaw I at the beginning of the 11th...

 mentioned in the Prague document from the 11th century AD. The area they inhabited was located on the Bóbr
Bóbr is a river which runs through the north of the Czech Republic and the southwest of Poland, a left tributary of the Oder River, with a length of and a basin area of .The Bóbr originates in the Rýchory mountains in the southeast of the Karkonosze range, where the source is...

river, from which they took their name.
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