L. CALPURNIUS PISO FRUGI. Denarius (90 BC). Rome.

This silver denarius was struck at Rome in 90 BC by the moneyer L. Calpurnius Piso Frugi, a member of the prominent plebeian gens Calpurnia. The type belongs to a very large and complex series issued during the Social War (91–88 BC), one of the principal Roman war coinages of the period. [en.numista.com]

Obverse

Laureate head of Apollo right, often accompanied by a control mark below or near the chin.

Apollo’s appearance references the family’s ancestral connection to the Ludi Apollinares, a festival established as permanent by an earlier Calpurnius Piso. [collection...ria.com.au]

Reverse

Nude horseman galloping right or left, usually holding a palm branch, whip, or torch.

Below the scene appears the moneyer’s name: L·PISO·FRVGI, sometimes accompanied by additional control marks or “ROMA” in exergue.