The follis (plural folles; Italian: follaro, Arabic: فلس, Fels) was a type of coin in the Roman and Byzantine traditions. Roman coin. The term follis is used for a large bronze Roman coin denomination introduced by Diocletian in about 294. The term "nummus" is now thought to be the actual ancient term, but usage of "nummus" has not caught on. At first the follis weighed about 10 grams and was about 4% silver, with a thin layer of silver on the surface. Over the next decades it declined both in size and in silver content.
https://en.wikipedia.org/wiki/Follis
The follis (plural folles; Italian: follaro, Arabic: فلس, Fels) was a type of coin in the Roman and Byzantine traditions. Roman coin. The term follis is used for a large bronze Roman coin denomination introduced by Diocletian in about 294. The term "nummus" is now thought to be the actual ancient term, but usage of "nummus" has not caught on. At first the follis weighed about 10 grams and was about 4% silver, with a thin layer of silver on the surface. Over the next decades it declined both in size and in silver content.
