A city in west-central, one of the centers of the early Polish kingdom established under Mieszko I during the second half of the 10th century. Beginning as a small stronghold in the 9th century, Poznan became the capital of Poland (with Gniezno) and the residence of Poland's first two sovereigns. The first Polish bishopric was founded here in 968. A 10th-century rampart and many relics of the Slavic period have been found.