Aquilon is a colony in the outer Puppis Sector of the Perseus Quadrant, quite close to the Caelum Sector of the Carinae Quadrant. It a temperate, Earthlike world with a human population numbering in the hundreds of millions.
An attack on Aquilon by forces of the Caelum Interstellar Empire was a precursor the Caelum Wars of the 75th through 78th Earth Century.