Denarius or Denaris was the Roman currency which was the standard Roman silver coin from its introduction in the Second Punic War c. 211 BC.
The word dēnārius is derived from the Latin dēnī "containing ten", as its value was originally of 10 assēs. The word for "money" descends from it in Italian (denaro), Slovene (denar), Portuguese (dinheiro), and Spanish (dinero). Its name also survives in the dinar currency.
Denarius on Wikipedia