The ''Follis'' was a form of Ancient Roman coinage, first used in the 2nd Century AD. They were attributed as being part of then Emperor Diocletian's reform of The Roman monetary system. Roughly 4% Silver (in it's thin outer covering) – The Follis was actually Bronze. It was seen as a cheap coin that could be readily used by the Common Class and for cheap Imports. Later in The Byzantine Empire (4th Century AD), The Follis was also adopted by Constantine – but it's actual worth is not really known.
The name ''Follis'' is translated from The Latin to mean ''Bag'' – a relation to perhaps the leather money bags the large amount of coins needed for transaction – were kept. Various Middle Eastern Caliphates also copied The Follis and introduced them into their currency as well.