Gaius Valerius Galerius Maximinus was originally named Daia. He was born of peasant stock to the half sister of the Roman emperor Galerius near their family lands around Felix Romuliana; a rural area now in the Danubian region of Serbia, then the newly reorganised Roman province of Dacia Aureliana subordinated to the later Prefecture of Illyricum. On the death of Galerius, in 311, Maximinus divided the Eastern Empire between Licinius and himself. When Licinius and Constantine began to make common cause with one another, Maximinus entered into a secret alliance with the usurper Caesar Maxentius, who controlled Italy. He came to an open rupture with Licinius in 313, he summoned an army of 70,000 men, but still sustained a crushing defeat at the Battle of Tzirallum.

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)