Maxentius 

Marcus Aurelius Valerius Maxentius, 306 - 312

Maxentius was the son of Maximian . In 306, he rebelled against the authority of Severus II. He was proclaimed Augustus at Rome, and invited his father, who had abdicated the year before, to join him. Severus marched against the rebels, but was defeated. The eastern Augustus, Galerius, then marched against Maxentius, but had to retreat as his troops became mutinous. At the conference of Carnuntum in 308, Maxentius was declared a public enemy (see under Maximian). In 311, a revolt took place in Africa, a province under Maxentius' control This rebellion was led by Lucius Domitius Alexander. The rebellion was quickly quashed, and Alexander executed. The following year, Maxentius faced Constantine I at the battle of the Milvian Bridge, and was killed.

AE Follis

Obv: Laureate bust of  Maxentius, right. 
IMP MAXENTIVS PF AVG

Rev : Roma, seated  within a hexastyle temple, holding a globe and staff.
CONSERV VRB SVAE

 In the reverse inscription,  Maxentius is hailed as the "saviour of our city". 

AD 306 - 312