Flavius Aetius (; 391–454), dux et patricius, commonly called simply Aetius or Aëtius, was a Roman general of the closing period of the Western Roman Empire. He was an able military commander and the most influential man in the Western Roman Empire for two decades (433-454). He managed policy in regard to the attacks of barbarian federates settled throughout the Western Roman Empire. Notably, he mustered a large Roman and allied (foederati) army to stop the Huns in the Battle of the Catalaunian Plains, ending the devastating Hunnic invasion of Attila in 451.