_Mettus_, dictator of Alba, had been called in to assist the Romans under Tullus Hostilius.

He came, but withdrew his troops in the middle of the battle.

For this treachery he was punished in the way Virgil describes.

_Horatius Cocles_ was the hero who guarded the Tiber bridge against Porsenna of Clusium.

_Cloelia_ was a Roman maiden who had been sent as a hostage to Porsenna.