Synonyma Ciceronis
The Synonyma Ciceronis (also spelled Sinonima Ciceronis, meaning "Synonyms of Cicero") is a Latin thesaurus drawn from the speeches of Cicero (106–43 BC). There are several different versions of the text and the "relationships between these versions are complex and unclear". In some manuscripts, the Synonyma is prefaced by a Pseudo-Ciceronian letter. The earliest manuscripts date to the 8th century.