a paramour of Mutilia Prisca, who had great influence with Livia, the mother of Tiberius, and whom Sejanus employed to injure Agrippina, the widow of Germanicus, in the opinion of Livia, A. D. 23. (Tac. Ann. 4.12.) In an inscription (Gruter, 113, 1) we find mention made of a C. Julius Sex. f. Postmuus, who was praefect of Egypt under Claudius: he was probably the son of the preceding.
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