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Quote:
The introduction of the large copper follis, worth 40 nummi, had been the
great innovation of Anastasius I in 498. The coin was marked with the
Greek letter M, which as a numeral stood for "40,"... a half-follis (was) marked with K

Quote:
The Constantinian subsidiary coinage...collapsed in the early fifth
century, at the time of the barbarian invasions. All that survived at the accession
of the emperor Anastasius I in 491 was the gold solidus and its two fractions,
the half (semissis) and the third (tremissis), and a tiny copper coin known as a
nummus, worth, in the mid-fifth century, 1/7200 of the solidus and weighing
less than 1 gram. In order to provide a stable subsidiary coinage, in 498
Anastasius introduced a series of multiples of the nummus, the chief of them
being a copper coin worth 40 nummi and known as a follis. This denomination
was to be one of the most conspicuous features of Byzantine coinage
for the next six centuries, and since only the solidus and its fractions are
earlier in date, it is with the creation of the follis that a history of Byzantine
coinage can most conveniently be begun.