Metamorphoses Book 15: Numa and the Foundation of Crotona
Numa was nominated to take the throne after Romulus died. He had once been to Crotona and had learned of its founding. Myscelus had dreams urging him to leave his homeland, which was treason. When he tried to leave to found a new city, he was put on trial for treason. He appealed to Hercules, the god who had urged him to leave. Hercules changed the pebbles that represented the verdict from black, which meant guilty, to white, which meant innocence. Myscelus then founded Crotona.