Elaborate monument erected by Octavian (later Augustus) in 29–27
According to the historian Dio Cassius (Roman History LI.i.3), after his victory Octavian laid a foundation of square stones on the spot where he had pitched his tent, which he then adorned with the captured ships’ rams. On this foundation, according to Dio, Octavian established an open-air shrine dedicated to Apollo. Suetonius (Augustus xviii.2) and Strabo (Geography VII.vii.6) corroborate this evidence, although the trophy itself (with the ships’ rams) was, according to Suetonius, dedicated to Poseidon and Mars, presumably for their help during the battle. The hill itself was, according to Strabo, sacred to Apollo, and therefore the shrine was dedicated to him....