Domitius Alexander was a high-ranking administrator in Carthage loyal to the Maxentius-Maximinus II alliance. It seems Maxentius ordered tribute from Alexander and he refused. The legions proclaimed him emperor and he held on for about a year before succumbing to loyalist soldiers.
RIC 68 AE Follis Obv: IMPALEXANDERPFAVG, laureate head right.
Rev: INVICTAROMAFELIXKARTHAGO Exe: PK, Carthage standing facing in long robe, head left, holding fruit in both hands. Lot sold for $2,800 1/16/02.