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Solidus (coin)

The solidus (the Latin word for solid) was originally a gold coin issued in the Late Roman Empire, and a weight for gold more generally, corresponding to 4.5 grams. It was introduced in 312 AD by Constantine I and replaced the older Aureus as the main gold denomination.

Roman and Byzantine coinage

The solidus (plural solidi) was introduced by Constantine I in 312 AD, permanently replacing the aureus as the gold coin of the Roman Empire. The solidus was struck at a rate of 72 to a Roman pound (est. 328.9 g) of pure gold, each coin weighing twenty-four Greco-Roman carats,[1] or about 4.5 grams of gold per coin. By this time, the solidus was worth 275,000 increasingly debased denarii.

The solidus was maintained essentially unaltered in weight, dimensions and purity until the 10th century. During the sixth and seventh centuries "lightweight" solidi of 20, 22 or 23 siliquae (one siliqua is 1/24 of a solidus) were struck along with the standard weight issues, presumably for trade purposes or to pay tribute. Many of these lightweight coins have been found in Europe, Russia and Georgia. The lightweight solidi were distinguished by different markings on the coin, usually in the exergue for the 20 and 22 siliquae coins and by stars in the field for the 23 siliquae coins.

File:CONSTANTINUS I RIC VII 48-651049.jpg
Solidus of Constantine I, minted in 324/5 AD

In theory the solidus was struck from pure gold, but because of the limits of refining techniques, in practice the coins were often about 23k fine. In the Greek-speaking world during the Roman period and then in the Byzantine economy the solidus was known as the nomisma (plural nomismata).[1] In the 10th century Emperor Nicephorus II Phocas (963-969) introduced a new lightweight gold coin called the tetarteron nomisma that circulated alongside the solidus, and from that time the solidus (nomisma) became known as the histamenon nomisma in the Greek speaking world. Initially it was difficult to distinguish the tetarteron nomisma and the histamenon nomisma because the coins had the same design, dimensions and purity, and there were no marks of value to distinguish the denominations. The only difference was the weight. The tetarteron nomisma was a lighter coin of approximately 4.05 grams and the histamenon nomisma maintained the traditional weight of 4.5 grams. To eliminate confusion between the new denomination and the old denomination, starting during the reign of Basil II (975-1025) the shape of the solidus (histamenon nomisma) was struck as a thinner coin with a larger diameter, but with the same weight and purity as before. From the middle of the eleventh century the large diameter histamenon nomisma was struck on a concave flan, though the smaller tetarteron nomisma continued to be struck on a smaller flat flan.

File:Tremissis Avitus-RIC 2402.jpg
Avitus tremissis, one-third of a solidus, ca. 456.

Former money changer Michael IV the Paphlagonian (1034–41) assumed the throne of Byzantium in 1034 and began the slow process of debasing both the tetarteron nomisma and the histamenon nomisma. The debasement was gradual at first, but then accelerated rapidly: approximately 21k during the reign of Constantine IX (1042-1055), 18k under Constantine X (1059-1067), 16k under Romanus IV (1068-1071), 14k under Michael VII (1071-1078), 8k under Nicephorus III (1078-1081) and 0k-8k during the first eleven years of the reign of Alexius I (1081-1118). Alexius reformed the coinage in 1092 and eliminated the solidus (histamenon nomisma) altogether. In its place he introduced a new gold coin called the hyperpyron nomisma at approximately 20.5k fine. The weight, dimensions and purity of the hyperpyron nomisma remained stable until the fall of Constantinople to the Crusaders in 1204. After that time the exiled Empire of Nicea continued to strike a debased hyperpyron nomisma. Michael VIII recaptured Constantinople in 1261, and the Byzantine Empire continued to strike the debased hyperpyron nomisma until the joint reign of John V-John VI (1347-1354). After that time the hyperpyron nomisma continued as a unit of account, but it was no longer struck in gold.

From the Fourth Century to the Eleventh Century most solidi were minted at the Constantinople Mint. However, solidi were also minted in Thessalonica, Trier, Rome, Milan, Ravenna, Syracuse, Alexandria, Carthage, Jerusalem and other cities. During the eighth and ninth centuries the Syracuse mint produced a large number of solidi that failed to meet the specifications of the coins produced by the imperial mint in Constantinople. The Syracuse solidi were generally lighter (approximately 3.8g) and only 19k fine.

Although imperial law forbade merchants from exporting solidi outside imperial territory, many solidi have been found in Russia, Central Europe, Georgia, and Syria. In the seventh century they became a desirable circulating currency in Arabian countries. Since the solidi circulating outside the empire were not used to pay taxes to the emperor they did not get reminted, and the soft pure-gold coins quickly became worn.[1]

Through the end of the 7th century, Arabian copies of solidi — dinars minted by the caliph Abd al-Malik ibn Marwan, who had access to supplies of gold from the upper Nile — began to circulate in areas outside the Byzantine Empire. These corresponded in weight to only Script error: No such module "convert"., but matched the weight of the lightweight 20 siliquae solidi that were circulating in those areas. The two coins circulated together in these areas for a time.[1]

The solidus was not marked with any face value throughout its seven-century manufacture and circulation[citation needed]. Fractions of the solidus known as semissis (half-solidi) and tremissis (one-third solidi) were also produced.[citation needed]

The word soldier is ultimately derived from solidus, referring to the solidi with which soldiers were paid.[2]

Impact on world currencies

In medieval Europe, when the only coin in circulation was the silver penny (denier), the solidus was used as a unit of account equal to 12 denier. Variations on the word solidus in the local language gave rise to a number of currency units:


File:Northern Gaul sou 440 450 4240mg.jpg
Northern Gaul "sou", 440–450, 4240mg.

In the French language, which evolved directly from common or vulgar Latin over the centuries, solidus mutated to soldus, then solt, then sol and finally sou. No gold solidi were minted after the Carolingians adopted the silver standard; thenceforward the solidus or sol was a paper accounting unit equivalent to one-twentieth of a pound (librum or livre) of silver and divided into 12 denarii or deniers.[3] The monetary unit disappeared with decimalisation and introduction of the Franc during the French revolution (1st republic) in 1795, but 5 centimes, the twentieth part of the Franc, inherited the name "sou" as a nickname.

To this day, in French around the world, solde means the balance of an account or invoice, and is the specific name of a soldier's salary. Sou is also used as slang for a small coin of little value, as in sans le sou meaning "without a sou", hence "broke", "without money".


In Quebec, sou is a commonly employed term for the Canadian cent (standard French, centime, not used in Quebec) although the term "cent" (colloquially pronounced cenne /sɛn/ when referring to currency in Quebec) is also widely used. Interestingly, quarter dollars in Quebec French are often called trente-sous (thirty cents) because of a series of changes in terminology, currencies, and exchange rates. After the British conquest of Canada in 1759, French coins gradually went out of use, and sou became a nickname for the halfpenny, which was similar in value to the French sou. Spanish dollars and U.S. dollars were also in use, and from 1841 to 1858 the exchange rate was fixed at $4 = £1 (or 400¢ = 240d). This made 25¢ equal to 15d, or 30 halfpence (trente sous). In 1858, pounds, shillings, and pence were abolished in favour of dollars and cents, and the nickname sou began to be used for the 1¢ coin, but the idiom un trente-sous for 25¢ endured.[4]


Main article: soldo

The name of the medieval Italian silver soldo (plural soldi), coined since the 11th century, was derived from solidus.

This word is still in common use today in Italy in its plural soldi with the same meaning as the English equivalent "money". The word "saldo", as the forementioned French solde, also means the balance of an account or invoice. It also mean "seasonal rebate", probably by contamination between the original meaning and the English word "sales".

Spain and Peru, Portugal and Brazil

As with soldier in English, the Spanish and Portuguese equivalent is soldado (almost the same pronunciation). The name of the medieval Spanish sueldo and Portuguese soldo (which also means salary) was derived from solidus, which is also used in the Philippines as Suweldo.

The Spanish and Portuguese word saldo, as the forementioned French solde, also means the balance of an account or invoice. And, for that matter in Afrikaans the word "saldo" means the balance of an account.

Some have suggested that the Peruvian unit of currency, the sol is derived from solidus, but the standard unit of Peruvian currency was the real up until 1863. Throughout the Spanish world the dollar equivalent was 8 reales ("pieces of eight"), which circulated legally in the United States until 1857. We hear echoes of that time in the expression "two bits" for a quarter dollar, and the real was last used for accounting in the US stock market, which traded in 1/8 dollars until 2001.

The Peruvian sol was introduced at a rate of 5.25 per British Pound, or just under four shillings (the legacy soldus). The term soles de oro was introduced in 1933, three years after Peru had actually abandoned the gold standard. In 1985 the Peruvian sol was replaced at one thousand to one by the inti, representing the sun god of the Incas. By 1991 it had to be replaced with a new sol at a million to one, after which it remained reasonably stable.

United Kingdom

King Offa of Mercia adopted the Frankish silver standard of libra, solidi and denarii; although for centuries English coinage was restricted to the silver penny, whereas the scilling, understood to be the value of a cow in Kent or a sheep elsewhere,[5] was a 12d money of account like its French equivalent, until the Tudors minted the first shilling coins. Prior to decimalisation in the United Kingdom in 1971, the abbreviation s., from solidus, was used to represent shillings, just as d. and £, from denarius and Librum, were respectively used to represent pence and pounds, leading to the abbreviation "£sd." The common use of a slash, e.g. 2/6 for two shillings and sixpence, was a holdover of the old orthographic long S.

See also


  1. ^ a b c d Porteous 1969
  2. ^ "Merriam-Webster Online Dictionary". Merriam-Webster. Retrieved 2008-12-05. 
  3. ^ Spufford, Peter (1993). Money and its use in medieval Europe. Cambridge University Press. pp. 7–9,18–19,25,33–35,37,50–52,397,400. ISBN 978-0-521-37590-0. 
  4. ^ Frédéric Farid (26 September 2008). "Pourquoi trente sous = 25 cents ?". Retrieved 6 October 2010. 
  5. ^ Hodgkin, Thomas (1906). The history of England ... to the Norman conquest. London, New York and Bombay: Longmans, Green, and Co. p. 234. 


  • Porteous, John (1969). "The Imperial Foundations". Coins in history : a survey of coinage from the reform of Diocletian to the Latin Monetary Union. Weidenfeld and Nicolson. pp. 14–33. ISBN 0-297-17854-7. 

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