The Greeks and Romans in the Black Sea and the importance of the Pontic region for the Graeco-Roman world (7th century BC-5th century AD): 20 years on (1997-2017) proceedings of the Sixth International Congress on Black Sea Antiquities (Constanta - 18-22 September 2017) - Tsetskhladze, Gocha R. 1963-2022; Avram, Alexandru 1956-2021; Hargrave, James (Archaeopress Publishing Ltd., 2021)