Gaius Vibius Trebonianus Gallus was born around the year AD 206 in Perugia (Italy). He married Afinia Gemina Baebiana and had two children with her, a son Gaius Vibius Volusianus and a daughter Vibia Galla. He appears to have had a traditional political career, serving as a senator and as consul. In AD 250, he became governor of Upper Moesia and, as governor, deeply involved with Decius' Danube wars, including the successful defence of the city of Novae. Murdered, with his son, in Italy by his own troops.

Main Roman Coin Book and Other References:

RIC = Mattingly, Harold    The Roman Imperial Coinage
BMC = Coins of the Roman Empire in the British Museum
RSC = Seaby, H A    Roman Silver Coinage
RCV = Sear, David R    Roman Coins and Their Values
Cr = Crawford, Michael    The Roman Republican Coinage
SB = Sear, David R    Byzantine Coins and Their Values
S = Coins of England and the United Kingdom
WW = Wildwinds.com (reference & attribution site)