quaestor in Bithynia, accused Granius Marcellus, the governor of that province, of treason in A. D. 15. From this time he became one of the state informers under Tiberius. (Tac. Ann. 1.74.) He may be the same as the Caepio mentioned by Pliny (Plin. Nat. 21.4. s. 10), who lived in the reign of Tiberius, and seems to have written a work on botany.