Aureolus was Master of the Horse under the Emperor Gallienus. He revolted against Gallienus and even though his troops declared him Augustus, he proclaimed his loyalty to Postumus and issued coins for him. The headquarters of Aureolus were in Milan and many of the coins he struck reference the “loyalty of the cavalry†(FIDES EQVIT). After Gallienus was killed, the new Emperor, Claudius II, executed Aureolus.
"News was now brought to Gallienus, who was involved in the war against the Scythians, that Aureolus, commander of all the cavalry posted at Mediolanum to prevent Postumus invading Italy, had revolted and was seeking supreme power." Zosimus 1:40
Postumus
circa A.D. 268
19mm 3.8gm
IMP POSTVMVS AVG; Radiate, draped and cuirassed bust right.
FIDES EQVIT; Fides seated left, a patera in her right hand and a standard in her left.
In ex. P
RIC V.2 Postumus 377
Mint of Milan
Issued under the authority of Aureolus