Follis or follaron? The name of the Byzantine coin of 40 nummi

The standard term for a Byzantine base-metal coin is follis, but this word is older than the coins that numismatists so name, meaning especially a bagged amount of currency, a usage which overlapped with the coins. This article shows that when the first such coins were introduced, in the reform of Anastasius I in 498 CE, contemporaries in fact called them follares, not folleis. The article sets out the evidence for this, and disarms apparent evidence for the term follis as meaning coins. It concludes that numismatists and curators should probably abandon the term follis for coins before at least the reign of Justin II (565-85 CE).