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Title: Nummus  
Author: World Heritage Encyclopedia
Language: English
Subject: Solidus (coin), Miliaresion, Byzantine coinage, Scyphate, Aspron
Collection: Coins of Ancient Rome, Coins of the Byzantine Empire
Publisher: World Heritage Encyclopedia


Nummi coins of the late reign of Anastasius I: on the left a 40-nummi coin (follis) and on the right a 5-nummi coin (pentanummium).

Nummus (Greek: νουμμίον, noummion), plural nummi (νοῦμμοι) is a Latin term meaning "coin", but used technically for a range of low-value copper coins issued by the Roman and Byzantine empires during Late Antiquity.


  • History 1
  • Use of term 2
  • References 3
    • Citations 3.1
    • Sources 3.2
  • Further reading 4


In circa 294, during the Tetrarchy, a new large bronze coin of circa 10 grams weight and 30 mm diameter appeared. Its official name was apparently nummus, but it is usually known among numismatists as the follis.[1] The term nummus is thus usually applied solely to the 5th–7th century Byzantine issues. These were small, badly struck coins, weighing less than 1 gram, forming the lowest denomination of Byzantine coinage. They were valued officially at 17,200 of the gold solidus but more usually rated to 16,000 or 112,000.[1] The nummus usually featured the profile of the reigning Byzantine emperor on the obverse and the Byzantine imperial monogram on the reverse, although some coins of Emperor Justinian I (r. 527–565) display its numerical value by the Greek numeral "A" instead.[1]

In 498, Emperor Anastasius I (r. 491–518) reformed the coinage (carried out by the comes sacrarum largitionum John the Paphlagonian[2]) by introducing multiples of the nummus, with denominations of 40 nummi, also known as a follis, 20 nummi (semifollis), 10 nummi (Greek: δεκανούμμιον, decanummium). These were also marked with Greek numerals representing their value: "M" for the follis, "K" for the semifollis and "I" for the decanummium. On the other hand, it appears that issue of the simple nummus was discontinued.[3] In 513, the weights of these coins were doubled, the pentanummium (Greek: πεντανούμμιον, 5-nummi coin marked with "E") introduced, and the minting of single nummi resumed.[4]

In 538/539, Emperor Justinian I introduced further changes to the 40-nummi follis, raising its weight to 25 grams. It was reduced again to 22.5 grams in 541/542, and further reductions followed until the century's end. At this time, a new 30-nummi coin (marked with "Λ" or "XXX") was introduced, but the single follis had ceased to be struck at Constantinople. It survived in the Exarchate of Carthage well into the 7th century however.[1][5] During the 7th century, the successive military and financial crises led to increased reduction in the weight and a marked deterioration of the quality of bronze coinage; by the time of Emperor Constans II (r. 641–668), a follis weighed only 3 grams. Consequently, the denominations lower than the semifollis were practically unmintable and abandoned.[6] Thereafter, the term nummus remained in use as a notional unit for 16,000 of the solidus, and in colloquial usage for "small change".[1]

Use of term

Variations of the term nummus appear in medical language, plant taxonomy, and fossil taxonomy:



  1. ^ a b c d e Kazhdan 1991, p. 1504.
  2. ^ Hendy 1989, p. 89.
  3. ^ Grierson 1999, pp. 17–18.
  4. ^ Grierson 1999, p. 18.
  5. ^ Grierson 1999, pp. 18–19.
  6. ^ Grierson 1999, p. 19.


  • Grierson, Philip (1999). Byzantine Coinage. Washington, District of Columbia: Dumbarton Oaks.  
  • Hendy, Michael F. (1989). The Economy, Fiscal Administration and Coinage of Byzantium. London, United Kingdom: Variorum Reprints.  

Further reading

  • Bates, George Eugene (1971). Byzantine Coins. Cambridge, Massachusetts: Harvard University Press. 
  • Grierson, Philip (1982). Byzantine Coins. London, United Kingdom: Methuen.  
  • Hendy, Michael F. (1985). Studies in the Byzantine Monetary Economy c. 300–1450. Cambridge, United Kingdom: Cambridge University Press.  
  • Sear, David R.; Bendall, Simon; O'Hara, Michael Dennis. Byzantine Coins and their Values. London, United Kingdom: Seaby. 
  • Whiting, Philip D. (1973). Byzantine Coins. New York, New York: G.P. Putman. 
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