In 1963, an Indiana construction engineer discovered a small hoard of coins on the bank of the Ohio River. Two of them eventually passed to a Clarksville museum, which identified them as Roman coins from the third century.

No one has explained how they came to be there. The engineer who found them said they’d been grouped as though in a leather pouch which had since disintegrated. But his name, and the rest of the hoard, has been lost.