The sol, later called a sou, is the name of a number of different coins, for accounting or payment, dating from Antiquity to today. The name is derived from the late-Roman and Byzantine solidus. Its longevity of use anchored it in many expressions of the French language.
See main article: article and Solidus (coin).
The solidus is a coin made of 4.5 g of gold, created by emperor Constantine to replace the aureus.
Doing honour to its name, the new currency earns the reputation of unalterability, crossing almost unchanged the decline and fall of the Western Roman Empire, and the great invasions and the creation of Germanic kingdoms throughout Europe. Not only was it issued in the Byzantine Empire until the 11th century under the name of nomisma, but the solidus was imitated by the barbarian kings, particularly the Merovingians, albeit most often in the form of a "third of a sou" (tremissis).
Facing a shortage of gold, Charlemagne introduced a new "stabilization" (as devaluations are often called): from then on the solidus no longer represents 1/12 of the Roman gold pound but 1/20 of the Carolingian silver pound instead. The sou itself was divided into 12 denarii and one denarius was worth 10 asses. With rare exceptions (such as Saint Louis' "gros"), the denarius was for a long time in practice the only coin in circulation, with solidi and pounds used only as accounting units.[1]
Charlemagne's general principle of 12 denarii worth one sol and of twenty sols worth one pound was eventually declined along many variants according to the alloy used and the dual metal gold:silver sometimes used for some issues. Only members of the money changers corporation could find their way among the equivalences and the many currencies used in Europe at each period, and therefore were unavoidable for most non-local commercial operations.
The name evolves as does the rest of the language, from Latin to French. Solidus becomes soldus, then solt in the 11th century, then sol in the 12th century. In the 18th century (Ancien Régime) the spelling of sol is adapted to sou so as to be closer to the pronunciation that had previously become the norm for several centuries.
In 1795, the livre was officially replaced by the franc and the sou became obsolete as an official currency division. Nevertheless, the term "sou" survived as a slang term for of a franc. Thus, the large bronze 5-centime coin was called "sou (for example in Balzac or Victor Hugo), the "pièce de cent sous ("hundred sous coin") meant five francs and was also called "écu (as in Zola's Germinal). The last 5-centime coin, a remote souvenir inherited from the "franc germinal", was removed from circulation in the 1940s, but the word "sou" keeps being used (except for the 1960 new franc's five-centime coin which was worth five old francs).
The term 'sou' is often used in the exclaimation "haven't got a sou". This is to denote that one has no money, not even a single coin. This phrase is used mostly without the knowledge of the source of the word 'sou'.
See also: Bouquet sou. In Canadian French, the word "sou" is used in everyday language and means the 1/100 division of the Canadian dollar. The official term is "cent". Canadian one-cent coins (no longer in circulation) have the vernacular name of "sou noir". The Canadian quarter, valued at 25 cents, is called trente sous ("thirty sous"). This usage dates from when the word “sou” was used in French-speaking Lower Canada to refer to the halfpenny coin of the Canadian pound; at that time an American quarter was valued at 1 shilling 3 pence Canadian (i.e. 15 pence Canadian), and the usage remained after Canada switched currencies. "Échanger quatre trente sous pour une piastre" ("to exchange four 30 sous for one piastre") therefore means changing something for an identical thing, as the "piastre" is the common name for the Canadian dollar.
In Switzerland, a hundred-sou coin is a five Swiss franc coin and a four sou coin is a twenty Swiss centime coin. The word sou also remains in informal language in the terms "ten, twenty ... sous".
The French term sou was borrowed into Vietnamese as the word xu / su (樞).[2] The term is usually used to simply mean the word "coin" often in compound in the forms of đồng xu (銅樞) or tiền xu (錢樞). The modern Vietnamese đồng is nominally divided into 100 xu.
Used for over a thousand years, the word "sou" is deeply rooted in the French language and expressions. Les sous, plural, is a synonym for money.