Signet from Istanbul: the flight of Aeneas from Troy.
Onyx Intaglio found by the Mud-washers of Constantinople.
CLARKE, Edward Daniel. Travels in various countries of Europe, Asia and Africa. Part the second: Greece, Egypt and the Holy Land: Section the third. To which is added a Supplement respecting the Author's Journey from Constantinople to Vienna, containing his Account of the Gold Mines of Transylvania and Hungary, London, T. Cadell and W. Davies, MDCCCXVI [=1816].
Art and antiquities
The Gennadius Library - The American School of Classical Studies at Athens