The Argenteus denomination
The argenteus was a silver coin produced by the Roman Empire from the time of Diocletian's coinage reform in AD 294 to ca. AD 310. It was of similar weight and fineness as the denarius of the time of Nero. The coin was produced at a theoretical weight of 1/96th of a Roman pound (about 3 grams), as indicated by the Roman numeral XCVI on the coin's reverse.
Argenteus

(1) Diocletian 294 AD
Obverse: laureate head right; DIOCLETI_ANVS AVG
Reverse: tetrarchs wearing military dress, sacrificing over tripod in front of turreted enclosure with gate; VIRTVS__MILITVM / A
Ref: RIC VI 40a; RSC 516g
(2) Maximian 295 AD
Obverse: laureate head right; MAXIMIA_NVS AVG
Reverse: tetrarchs sacrificing before six-turreted enclosure; VIRTVS_MILITVM
Ref: RIC 18b; RSC 622d