This is one of the earliest rock monasteries in Bulgaria. It is assumed, its creation took place in the 9th-10th century, when large scale construction was going on at the same time in the NE part of the country. It has been known as well established monastery in the 12th-13th centuries.

For more information on Aladja monastery, please click on this link [ http://www.sofiaecho.com/article/notes-from-hsitory---medieval-treasures-of-orthodox-culture/id_9454/catid_32