It was first excavated in 1915 and 1919 by Czech-Bulgarian brothers Karel and Hermann Skorpil, the founders of modern-day Bulgarian archaeology, who found three reliquaries – a golden, marble, and silver one – placed one inside of the other, which contained relics of an unknown Christian saint.
The monastery was inhabited by Christian monks, and since its architecture and mosaics are not typical for the Balkan Peninsula but resemble some similar sites in the easternmost provinces of the Roman Empire, it is believed that it was founded by a group of Christians who came from the Middle East.
Contains a logbook with a pencil. You will find the cache somewhere among the ruined walls in the middle area of the site. You can reach the place pretty easily by car. Getting there by bike is also possible, but beware that you need to climb ~1 km hill, which has quite serious incline. Muggles can be camping near the place (mostly at dusk), but durning the day the place is mostly muggle free.