Over the course of the 1st millennium BC the Greeks, Romans, and Carthaginians established colonies on the Mediterranean coast and the offshore islands. The Roman Republic annexed southern Gaul as the province of Gallia Narbonensis in the late 2nd century BC, and Roman forces under Julius Caesar conquered the rest of Gaul in the Gallic Wars of 58–51 BC. Afterwards a Gallo-Roman culture emerged and Gaul was increasingly integrated into the Roman Empire.