Murfatlar Cave Complex

From the English Wikipedia page - there is somewhat more information on the Bulgarian and Romanian Wikipedia pages.
Basarabi Cave Complex or Murfatlar Cave Complex is a medieval Christian monastery located near the town of Murfatlar (named Basarabi between 1924–1965 and 1980–2007), Constanţa County, Dobrogea, Romania.
In 1957, a little complex of cells dwellings, small churches, crypts and tombs, used from the 9th until 11th century, was discovered in a caves carved into a chalk hill. At that time the territory was under the control of the Byzantine Empire and First Bulgarian Empire. After the fall of this Bulgarian state, the place was abandoned.
There are many inscriptions graved on the walls in Old Slavic Glagolitic and Cyrillic, some in Greek alphabet some in Turkic runes and some in Romanian. The language of the Slavic texts is Old Bulgarian. The language of the Turkic runes is Proto-Bulgarian, as suggested by Bulgarian scholars, or Turanic, as implied by Romanian scholars. In fact that may be the same, because the Proto-Bulgarian language most probably is a mix of Turanic and Aryan origin. Some Romanian scholars questioned the Latin origin of the names such as "Petre" found in the cave. Petre it is a classic Romanian name. It is a derivative from the Greek πέτρα and of the name of Saint Peter, which is widespread Christian name. Others even look to the possibility of Nordic "Rainpilpe" of inscriptions. Among the drawings on the walls they see the representations of Viking ships (because the land of Dobrogea was most likely near the trading routes between the Vikings and the Constantinople). Still, Rainpilpe is not of a known Northern origin, and the low hull banana-shaped keel of the so-called Viking ship resembles Mediterranean patterns.
Category:Undeciphered inscriptions
Category:20th century