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Called Petrich by some, Asen’s Fortress (Asenova Krepost) is a medieval fortress in Bulgaria’s Rhodope Mountains. Sitting high on a rocky ridge on the left bank of the Asenitsa River, the fortress was built during the reign of Byzantine Emperor Justinian the Great in the 6th century and grew to prominence during the Middle Ages. It fell into ruins after the Ottoman conquest in the 14th century, with only the Church of the Holy Mother of God surviving. One of the oldest remaining Eastern Orthodox churches, the two-story building features a large rectangular tower and mural paintings that date back to the 14th century. Renovated in 1991, it is used today by the Bulgarian Orthodox Church.
The fortress is also a stop on a hiking trail that takes hikers on to several chapels and, eventually, Bachkovski Monastery.