Commodus
Solo reign (180–192)
Upon his ascension, Commodus devalued the Roman currency. He reduced the weight of the denarius from 96 per Roman pound to 105 per Roman pound (3.85 grams to 3.35 grams). He also reduced the silver purity from 79 percent to 76 percent – the silver weight dropping from 2.57 grams to 2.34 grams. In 186 he further reduced the purity and silver weight to 74 percent and 2.22 grams respectively, being 108 to the Roman pound. His reduction of the denarius during his rule was the largest since the empire's first devaluation during Nero's reign.
Commodus-11