Postumus - Minerva Fautrix!

Postumus, summer 260 - spring 269 A.D.
The interesting reverse legend MINER FAVTR stands for Minerva Fautrix, the favouring (partisan) Minerva. Perhaps the message is that Minerva offered Postumus wisdom, military power (note the spear and shield), and peace (note the branch).
AE antoninianus, RIC V 74, RSC IV 195, VF, Lugdunum mint, 2.86 g, 22 mm, obverse IMP C POSTVMVS P F AVG, radiate, draped and cuirassed bust right; reverse MINERVA FAVTR, Minerva advancing left, olive-branch in right, spear and shield in left