Shortly after the conference at Carnuntum in A.D. 308 and the elevation of Licinius to Augustus; a new title was seen on coinage for Maximinus and Constantine I which proclaimed that they were sons (filius) of Augusti. This was an attempt by Galerius to placate them; which failed as they both rejected the title. Constantine had already claimed the title of Augustus in A.D. 307 and Maximinus thought he deserved to be Augustus after the death of Severus. Only Eastern mints struck these types. In A.D. 310, Galerius finally recognized Constantine and Maximinus each as Augustus.
Constantine I
A.D. 309-310
Ӕ follis 23mm 6.7g
FL VAL CONSTANTINVS FIL AVG; laureate head right.
GENIO CAESARIS; Genius standing left, modius on head, naked except for chlamys over left shoulder, holding patera from which liquid flows & cornucopiae; K in left, A over P in right.
In ex. ALE
RIC VI Alexandria 99b