a grammarian, who sometimes also pleaded causes, lived in the reign of Tiberius, and was celebrated as a rigid purist in language. There is an anecdote respecting this Marcellus and the emperor Tiberius related in Vol. I. p. 599b. (Suet. de Illius. Gramm. 22; D. C. 57.17.)
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890