The identity of these merchants is unknown. It has been theorised that they were Phoenicians, but there is no evidence for this. Professor Timothy Champion, discussing Diodorus Siculus's comments on the tin trade, states that "Diodorus never actually says that the Phoenicians sailed to Cornwall. In fact, he says quite the opposite: the production of Cornish tin was in the hands of the natives of Cornwall, and its transport to the Mediterranean was organised by local merchants, by sea and then over land through France, well outside Phoenician control." There is isotopic evidence to support that tin ingots found off the coast of Haifa, Israel were supplied from Cornwall. (For further discussion of tin mining see the section on the economy below.)