Original: The biggest green area in Chojnów is small forest Park Piastowski ( Piast 's Park ) , which was named after the Piast dynasty as part of Communist anti-German propaganda upon its annexation to Poland according to the Potsdam Conference .
Simplified: The biggest green area in Chojnów is small forest Park Piastowski ( Piast 's Park ) , named after Piast dynasty as part of Communist anti-German propaganda .