denier (n.1)

medieval French silver coin corresponding to the English penny, early 15c., from Old French dener, a small coin of slight value, roughly equivalent to the English penny, in use in France from the time of Charlemagne to early modern times, from Latin denarium, from denarius, name of a Roman coin (source also of Spanish dinero); see denarius.

"one who denies," c. 1400, agent noun from deny (v.).