常州 ;  pinyin : Chángzhōu;  Wade-Giles : Ch'ang-chou; Gwoyeu Romatzyh : Charng jou; formerly romanized as Changchow ) is a prefecture-level city in southern Jiangsu province of the People's Republic of China . It was also known as Yanling, Lanling, Jinling, and Wujin previously. Located on the southern bank of the