According to Bulgarian archaeologists, the stone quarry was built in the first quarter of the 10th century to supply stone blocks to a building of a 39 km-long stone wall stretching from the Danube to the Black Sea coast. Known are six panels of Rock art carved in the soft walls of the chalk quarry. They are available either as photos. Figure 1 , General plan of Murfatlar Cave Complex. or/and sketches, and their quality and accuracy vary significantly. In the first of them is carved a unique cross, boot and a figure of an animal, probably a horse . The cross here consists of a square and four V signs. Since the signs can be seen as phallic symbols, and the square - the vulva of an agrarian goddess, the image will symbolise the fertilisation of the earth and the expected abundance of food as a result (Fig. 3a). The second rock image Figure 2 , Section of the rock massif showing the location of some of the temples. consists...