La fortezza di Assen

Asen's Fortress (Bulgarian: Асенова крепост, Asenova krepost), identified by some researchers as Petrich (Петрич), is a medieval fortress in the Bulgarian Rhodope Mountains, 2 to 3 kilometres (1.2 to 1.9 mi) south of the town of Asenovgrad, on a high rocky ridge on the left bank of the Asenitsa River.

The Church of the Holy Mother of God (Bulgarian: църква "Света Богородица", tsarkva "Sveta Bogoroditsa") is the popular name of a medieval Eastern Orthodox church located in Asen's Fortress. It lies near Asenovgrad in the Rhodope Mountains of Plovdiv Province, south central Bulgaria. Constructed most likely in the 12th century, it features two stories, of which the upper story is the church proper and the lower story is of unclear function.