After the Gallic Wars, Monoecus, which served as a stopping-point for Julius Caesar on his way to campaign in Greece, fell under Roman control as part of the Maritime Alps province (Gallia Transalpina).
The port is mentioned in Pliny the Elder's Natural History (III.v) and in Tacitus' Histories (III.42), when Fabius Valens was forced to put into the port (Fabius Valens e sinu Pisano segnitia maris aut adversante vento portum Herculis Monoeci depellitur).