Castle at the Black Sea. The author states that he saw this depiction on the reverse of an ancient Greek coin, discovered in the area.
[Castle, represented on a Greek Medal, of very high antiquity.]
CLARKE, Edward Daniel. Travels in various countries of Europe, Asia and Africa by Edward Daniel Clarke LL.D. Part the First. Russia Tatary and Turkey, London, Printed for T. Cadell and W. Davies, 1810.
Architecture and built environment
The Gennadius Library - The American School of Classical Studies at Athens