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This is an ancient Roman gold Aureus, of Emperor Trajan, minted at Rome in 100 AD
Obverse: IMP CAES NERVA TRAIAN AVG GERM "Supreme commander (Imperator), Caesar, Nerva Trajan, emperor (Augustus), conqueror of the Germans." Bust of Trajan, laureate right.
Reverse: PM TRP COS III P P, "High priest, holder of tribunician power, consul for the third time, father of the nation" Hercules, naked, standing front on low base, holding club downwards in right hand and lion-skin over left arm.
A wonderful coin with a good portrait and original mint lustre, A similar example in the British Museum collection R.6675
DENOMINATION: Aureus (of 25 denarius)
DATE: 98 - 117 AD (this coin was minted at Rome in 100 AD)
SIZE: 18.4mm dia
ATTRIBUTION: RIC II# 37 (aureus), OCRE# ric.2.tr.37_aureus
PROVENANCE: Private collection. Reims, France.