This is one of my favourite coins:-
Probus Antoninuanus
Obv:– VIRTVS PRO-BI AVG, Radiate, helmeted, cuirassed bust left, holding spear and shield, decorated with emperor riding past row of soldiers with shields
Rev:– ADVENTVS PROBI AVG, Emperor riding left, right hand raised, left holding sceptre; at foot, captive
Minted in Lugdunum (IIII) Emission 5 Officina 4. End A.D. 277 to Early A.D. 278
Ref:– Cohen 69. Bastien 256 (2 examples cited). RIC 64 Bust Type G.
Minted to commemorate the return of the Emperor through Lugdunum on his way to Rome after a successful campaign against the German tribes.
A crisp example with full silvering. The shield is decorated with the emperor on horseback riding past his troops with a raised hand.

Regards,
Martin