Some of the villages founded by settlers from Bela include Gościęcin (original German name: Kostenthal), founded in 1225, and Kazimierz (original German name: Kasimir bei Oberglogau), founded in 1240.
Mieszko's son Casimir I of Opole, Duke from 1211, invited German settlers immigrating to his duchy in the course of the Ostsiedlung, and granted German town law to settlements like Leśnica, Ujazd, Gościęcin, Biała and Olesno.