A more thorough explanation:

Definition: An argentarius miles was a money porter in medieval times who carried money from the lower to the upper Exchequer to be examined and tested.

Example: In medieval England, the argentarius miles was responsible for transporting coins and other forms of currency from the lower Exchequer to the upper Exchequer. Once there, the money would be counted, weighed, and tested for purity to ensure that it was not counterfeit.

Explanation: The example illustrates how the argentarius miles was an important figure in medieval finance. They were responsible for ensuring that the money in circulation was legitimate and not counterfeit. This was an important task, as counterfeit money could destabilize the economy and cause inflation. The argentarius miles played a crucial role in maintaining the integrity of the monetary system.