Polanie

Two tribes, the Polanie—based around the fortified settlement (castrum) of Gniezno—and the Wiślanie—who lived near Kraków—expanded to bring other tribes under their control.

…that a stronghold of the Polanie tribe existed there in the 8th century ce. In 1000 Gniezno became capital of the first Roman Catholic archdiocese of Poland; it received town privileges in 1240. The town survived the advance of the Teutonic Knights in the 14th century and the Swedish wars…