The Valerius was a Primus class battle cruiser in the Centauri Republic. It supported an impressive arsenal of weapons.

In 2259, during the Narn-Centauri War, the Valerius was one of the Centauri warships to be retrofitted with a highly illegal mass driver system. The Valerius was the lead ship in the fleet of the Centauri warships that took part in the final assault on the Narn Homeworld, plucking asteroids out of near orbit and bombarding the planet from space for days on end until the Narn Regime's unconditional surrender. To personally oversee their victory, Lord Refa specially reserved a place on board for himself and Londo Mollari. Londo watched the terrific devastation through one of the viewports.[2][3][4][5][6]