Some 1,500 years ago, a man was travelling east along the North African coast and stopped off at the beach town of Utica, in what is now Tunisia. Perhaps he noticed the tooth himself and stooped to pick it up. Perhaps he was shown it by a local resident. It was apparently shaped enough like the tooth of a human for this man – Augustine, sainted bishop of Hippo – to think it was proof of the existence of “the giants of old.”