The territory on which they lived became a part of the first Polish state created by duke Mieszko I and expanded at the end of the 10th century, enlarged further by conquests of king Bolesław I at the beginning of the 11th century.
The most important tribes who were conquered by Polans were the Masovians, Vistulans, Silesians and Pomeranians.
The Polish tribes were polytheistic pagans and worshiped a pantheon of numerous deities, each representing a different but equally important aspect of life for the Early Slavs - such as Perun, god of lightning.
A tribe's territory was divided into opoles, which constituted a group of neighboring settlements.
Most members of a particular tribe were yeoman peasants, although a small group of aristocrats (nobiles or potentiores) was usually present.