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This is an ancient Roman silver denarius, of Emperor Maximinus I, ("the Thracian") minted in Rome between 235 - 236 AD.
Obverse: IMP MAXIMINVS PIVS AVG, "The emperor Maximinus, pious [and] blessed august" laureate, draped bust right.
Reverse: FIDES MILITVM, "Faith of the soldiers" Fides standing left, a standard in each hand. This refers to "The loyalty of the soldiers".
This is a superb coin, well struck and with a strong and bold portrait of this soldier emperor, easily EF.
DATE: 235 - 238 AD (This coin was minted in Rome between 235 - 236 AD)
SIZE: 20mm dia
WEIGHT: 2.96 grams
ATTRIBUTION: RIC 7a, RSC 7. s2337
PROVENANCE: Private collection. Lisboa, Portugal