Other Roman coins have been found in Nigeria and Niger, and also in Guinea, Togo and Ghana. However, it is much more likely that all these coins were introduced at a much later date than that there was direct Roman intercourse so far down the western coast. No single article unmistakably originating in Africa south of the Equator has been discovered in the Graeco-Roman world or in contemporary Arabia, nor is there any mention of such an article in written records: while the coins are the only ancient European or Arabian articles that have been found in the central parts of Africa.[14]