GALLUS, G. VIBIUS TREBONIANUS, Roman em peror A.D. or 4, held a command in the army that opposed the first invasion of the Goths in 251, and, according to a possi bly inaccurate tradition, contributed by his treachery to the disaster that followed, in which Decius and Herennius were killed. Gallus was then elected emperor, and made peace with the in vaders, who kept their plunder and were offered a tribute to bribe them not to return ; it is the disgrace with which this treaty covered his name that makes the tradition of his earlier conduct suspect. A year later fresh hordes arrived, but were routed by Aemilianus whom his troops proclaimed emperor. Gallus went to meet him, but was defeated and killed at Interamna.
See Zonaras XII. 20 seq.; Zosimus I. 23, 28; Eutropius IX. 5; Vic tor, De Caes. 3o ; Jordanes, De Reb. Get. 19.