Fullofaudes was a Dux Britanniarum, a military leader in Roman Britain in the later fourth century.
[1] He was either killed or besieged by the barbarian invaders during the Great Conspiracy and replaced by Dulcitius when Count Theodosius came to Britain in 369 to restore order.
[2] He was probably defeated in the north of Britain; the outpost forts north of Hadrian's Wall were abandoned at this time.
It may be that his own troops rebelled under him and switched allegiance to the enemy; Ammianus' description is unclear.