2. A friend of Pliny the younger, who addresses two letters to him (Ep. 5.21, 7.25). His gentile name is not mentioned by Pliny. There were four other correspondents of Pliny who bear the cognomen of Rufus; namely, Calvisius, Caninius, Octavius, and Sempronius, all of whom are mentioned below in alphabetical order.
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