Ausonia is a town and comune in southern Lazio, central Italy. It takes its name from the Ausones/Aurunci, whose ancient town Ausona, locateā¦Ausonia is a town and comune in southern Lazio, central Italy. It takes its name from the Ausones/Aurunci, whose ancient town Ausona, located nearby, was destroyed by the Romans in 314 BC. In the Middle Ages it was known as Fratte.