U+10195 Roman Siliqua Sign

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The siliqua (pl. siliquas or siliquae) is the modern name—given without any ancient evidence to confirm the designation—to small, thin, Roman silver coins produced in the 4th century and later. When the coins were in circulation, the Latin word siliqua was a unit of weight or value defined by one late Roman writer as one twenty-fourth of a Roman solidus.

"Siliqua vicesima quarta pars solidi est, ab arbore, cuius semen est, vocabulum tenens."
A siliqua is one twenty-fourth of a solidus, having its name from the tree of which it is the seed.

The term siliqua comes from the siliqua graeca, the seed of the carob tree, which in the Roman weight system is equivalent to 1⁄6 of a scruple (1⁄1728 of a Roman pound or about 0.19 grams).

The term has been applied in modern times to various silver coins on the premise that the coins were valued at 1⁄24 of the gold solidus (which weighed 1⁄72 of a Roman pound) and therefore represented a siliqua of gold in value. Since gold was worth about 12 times as much as silver in ancient Rome (in Diocletian's Edict on Maximum Prices of 301), such a silver coin would have a theoretical weight of 2.22 grams ((4.45 grams/24)x12 = 2.22 grams). This has not prevented the term from being applied today to silver coins issued by Constantine, which initially weighed 3.4 grams and to the later "heavy siliqua" of Constantius II of c. 3 grams, but it would fit the later "light" or "reduced siliqua" from after the reform of 355 which weighed about 2.2 grams. The term is one of convenience, as no name for these coins is indicated by contemporary sources. Thin silver coins as late as the 7th century which weigh about 2–3 grams are known as siliquas by numismatic convention.

The majority of examples suffer striking cracks (testimony to their fast production) or extensive clipping (removing silver from the edge of the coin), and thus to find both an untouched and undamaged example is fairly uncommon. It is thought that by clipping, siliquaes provided the first coinage of the Saxons, as this reduced them to around the same size as a sceat, and there is considerable evidence from archaeological sites of this period, that siliquas and many other Roman coins were utilized by Saxons as pendants, lucky charms, currency, and curiosities.