Caesar named Aquitania the triangle shaped territory between the Ocean, the Pyrenees and the Garonne river. He fought and almost completely subdued them in 56 BC after Publius Crassus's military exploits assisted by Celtic allies. New rebellions ensued anyway up to 28-27 BC, with Agrippa gaining a great victory over the Gauls of Aquitania in 38 BC. It was the smallest region of all three mentioned above. A land extension stretching to the Loire River was added by Augustus, following the census conducted in 27 BC, based on Agrippa's observations of language, race and community according to some sources. At that point, Aquitania became an imperial province and it, along with Narbonensis, Lugdunensis and Belgica, made up Gallia. Aquitania lay under the command of a former Praetor, and hosted no legions.