Tin trade. Tin was pretty rare and IIRC the fertile crescent and Egypt are thought to have imported it from Cornwall or Iran/India. Pithy quote: Strabo (Geography, 3.5.11) mentions the important ancient tin trade with the Kassiterides, the 'Tin Islands', which have often been credibly identified with either the Isles of Scilly or Cornwall, and goes on to state that 'in former times it was the Phoenicians alone', from Cadiz, 'who carried on this commerce'.(10)