451, but the general, Aetius, was "the last of the Romans," and in 486 Clovis the Frank ended the last vestige of Roman rule in Gaul.
Thus it is on his sole, though in this instance perhaps trustworthy, testimony that the famous letter rests, said to have been sent to Rome in 446 by the despairing Britons, commencing: - "To Agitius (Aetius), consul for the third time, the groans of the Britons."
He then invaded the territory of Arras, but was severely defeated at Hesdin-le-Vieux by Aetius, the commander of the Roman army in Gaul.
Aetius welcomed him warmly and sent him back a friend and foederatus.
Hoffmann the earliest mention of destillatio per descensum occurs in the writings of Aetius, a Greek physician who flourished at about the end of the 5th century.