Asenova Fortress is situates in the Rhodope Mountains, 2-3 km south of Asenovgrad. The earliest archaeological findings date back to the time of the Thracians. The fortress gained importance in the Middle Ages, first mentioned in the statute of the Bachkovo Monastery as Petrich in the 11th century. The fortress was conquered by the armies of the Third Crusade. It was considerably renovated in the 13th century during the rule of Bulgarian tsar Ivan Asen II to serve as a border fortification against Latin raids, as evidenced by an eight-line wall inscription.