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| uncia | |
|---|---|
| Name | Uncia |
| Country | Roman Republic, Roman Empire, Byzantine Empire |
| Denomination | Uncia (1/12) |
| Value | 1/12 of an as; later variable |
| Mass | variable |
| Composition | Bronze, copper, silver (later) |
| Obverse | Various magistrates, deities |
| Reverse | Various symbols, animals, numerals |
| Years of minting | c. 3rd century BC – medieval periods |
uncia
The uncia is an ancient Roman denomination and measurement term originally denoting one twelfth of an as and later applied to weight and length. It functioned within the monetary systems of the Roman Republic and Roman Empire before evolving in Byzantine and medieval contexts into weight and linear units used across Europe. Archaeologists and numismatists study unciae to trace monetary reform, metallurgical practice, and cultural diffusion in antiquity and the Middle Ages.
The term derives from Latin roots recorded by Marcus Terentius Varro, Varro, and appears in sources such as Pliny the Elder and legal texts associated with Twelve Tables jurisprudence. Classical lexicographers like Gaius Julius Hyginus and commentators linked the word to Roman fractional notation used by magistrates in the era of the Roman Republic and classical grammarians citing Cicero. Medieval chroniclers influenced by Isidore of Seville and transmission via monastic scriptoria preserved the term into the Carolingian era associated with Charlemagne's reforms.
As a coin, the unit was struck in bronze during periods of Republican coinage reform under magistrates associated with families such as the Fabii, Aemilii, and Claudius. Republican unciae sometimes bear magistrate names linked to gens like Fabius, and imagery comparable to contemporaneous issues by moneyers who also produced denarii referenced in hoards associated with the Second Punic War and the aftermath of the Battle of Cannae. Numismatists compare uncia iconography with obverse types seen on Republican issues cataloged in collections at institutions such as the British Museum, the Numismatic Museum of Athens, and the American Numismatic Society. During the Principate, monetary consolidation under Augustus and later emperors like Nero and Diocletian reduced the circulation of fractional bronze types, while imperial fiscal measures recorded in sources tied to the Edict on Maximum Prices affected small change.
In Byzantine practice the term (rendered in Greek forms in contemporary chancery records) sometimes designated small bronze denominations and weight fractions in fiscal accounts preserved in archives associated with Constantinople and monasteries like Mount Athos. Medieval European usage reappeared in charters of Carolingian rulers, in the coinage systems of Anglo-Saxon England and Capetian France, and in vernacular accounting such as the Assize of Weights and Measures context. Regional mints—examples being those in Córdoba, Milan, and Winchelsea—reflect adaptations of fractional units during monetary transitions involving rulers like Alfonso VI and William the Conqueror. The term influenced monetary vocabularies appearing alongside currencies such as the pound sterling, libra, and solido in medieval ledgers.
The lexical evolution assigned the word to linear and mass measures—parallel to measures attested in Roman technical texts by Vitruvius and agricultural treatises of Columella. The uncia as a length corresponds to one twelfth of the Roman pes cited in building records linked to projects in Ostia Antica and Roman engineering manuals. As a mass unit it equated to one twelfth of the Roman libra noted in commercial law cases recorded in Digest of Justinian excerpts and later practical handbooks used by craftsmen in guilds in cities like Florence, Ghent, and Prague. Scholarly reconstructions compare ancient measures using surviving scales from excavations in Pompeii and measurements inscribed on lead weights recovered at sites such as Ephesus.
Archaeological contexts producing unciae include coin hoards from conflict periods like the Social War and the Gothic Wars, single-find contexts in villas excavated near Tivoli, and stratified deposits at marketplaces in Pompeii and Herculaneum. Important numismatic finds are cataloged within collections at the Museo Nazionale Romano, the Louvre, and the Bibliothèque nationale de France; provenance studies tie some specimens to excavations funded by patrons connected to institutions such as the Society of Antiquaries of London. Metallurgical analyses using techniques promoted by laboratories at Oxford University and CNRS compare alloy composition of unciae to contemporary sestertii and asses, informing debates about debasement under emperors like Gallienus and monetary responses to crises recorded by chroniclers such as Procopius.
The term left a lasting imprint across Romance and Germanic languages, contributing to words for ounce and inch in languages influenced by medieval Latin transmission documented in glossaries compiled by Alcuin and later lexicographers like Samuel Johnson for English technical vocabulary. It appears in toponymy where medieval measures were used in land descriptions in charters of Normandy and Aquitaine, and in idiomatic expressions preserved in proverbs collected by antiquarians linked to Folklore studies institutions. Modern numismatics, philology departments at universities including Cambridge University, University of Bologna, and museums maintain research programs tracing the semantic shifts of the term across legal, fiscal, and everyday registers.
Category:Roman coins Category:Ancient Roman measurements