No 13D

Location: In the northeast corner of the southern gallery, on the short north wall to the left of door No 51.

Material: Marble surface, 6th century.

Dimensions: 6 cm (diameter of the outer circle), at eye level.

Condition: A shallow carving, not intersected by other marks.

Technique: Incised.

Description: The design consists of two circles—small and large—placed one inside the other and connected by four radiating lines resembling spokes.

Attribution: An apotropaic symbol or protective mark.

Publications: Thomov, Th. The Game of “Nine-Mens Morris” in the Church of St Sophia, Constantinople, in Bulgarian Middle Ages: Alliance, Power, History, ed. by Georgi Nikolov and Angel Nikolov (Sofia: University of Sofia St Kliment Ohridski Press, 2013), 437-452.

Commentary: Thomov, The Game of “Nine-Mens Morris”, 437-452.

Date: Unknown.