Asenovgrad (äsānôvˈgrät) [key], city (1993 pop. 52,019), S central Bulgaria. It is a commercial center, with wineries and tobacco manufactures. An ancient Bulgarian stronghold, it became a trade center under Turkish rule (15th–19th cent.). Asenovgrad has several 16th-century churches as well as the ruins of a 13th-century castle. The city was formerly known as Stanimaka.