Ancient lead ingot found in Lillebonne in 1840, at the bottom of the Roman theatre's outer wall. Weight : 43,5 kg
Lead was extracted in great quantity in the Roman period, in Brittany mines, where an example of fistula lead can still be seen in Bath.
Elkington, David. "The mendip lead industry". In The Roman West Country : Classical Culture and Celtic Society. 1976. p.188, 195, 234