Actium, a promontory in Acarnania, at the entrace to the Ambracian Gulf. Here stood a famous temple of Apollo, and the coast was dreaded by sailors. The spot is famous for the sea-fight, in which Augustus defeated Antony, B.C. 31. To commemorate his victory, Augustus instituted quinquennial games called Actia, and founded Nicopolis, on the opposite shore of the straits.