1. References

2. Sources

The term trachy ({{lang-el|τραχύ}}), plural trachea (τραχέα), meaning "rough" or "uneven", was used to describe the cup-shaped (incorrectly often called "scyphate") Byzantine coins struck in the 11th–14th centuries.{{sfn|ODB|loc="Trachy" (Ph. Grierson), p. 2101}} The term was properly applied to coins of electrum, billon, or copper, and not to the gold hyperpyra.{{sfn|ODB|loc="Trachy" (Ph. Grierson), p. 2101}}

References

Sources

• {{cite encyclopedia | editor-last=Kazhdan | editor-first=Alexander | editor-link=Alexander Kazhdan | year=1991 | encyclopedia=The Oxford Dictionary of Byzantium | publisher=Oxford University Press | location = Oxford and New York | isbn=978-0-19-504652-6 | ref={{harvid|ODB}}}}

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