Silesian tribes

The Silesian tribes is a term used to refer to tribes, or groups of West Slavs that lived in the territories of Silesia in the Early Middle Ages. The territory they lived on became part of Great Moravia in 875 (now mostly in the Czech Republic) and later, in 990, the first Polish state created by duke Mieszko I and then expanded by king Boleslaw I at the beginning of the 11th century. They are usually treated as part of the Polish tribes and sometimes as part of the Germanic tribes. Two tribes among them are sometimes considered as Czech (Moravian) tribes.