Roman merchants could travel from Rome to Londinium paying denarii all the way.
Britain's largest hoard of Roman silver denarius coins has been valued at £265,000.
Although the value of these tetradrachmas can be reckoned as being equivalent in value to the denarius, their precious metal content was always much lower.
He increased the silver purity of the denarius from 51.5% to 58% the actual silver weight increasing from 1.66 grams to 1.82 grams.
He also distributed a new commemorative denarius coin in honor of the event.
The following year he decreased the amount of base metal in the denarius while adding more silver raising the silver purity and weight again to 50.5% and 1.50 grams.
