The Greek term , in rhetoric, means substituting any epithet or phrase for a proper name, as "Pelides", signifying the "son of Peleus", to identify Achilles. An opposite substitution of a proper name for some generic term is also sometimes called , as a Cicero for an orator. The use of a father's name or ancestor's name, such as "Pelides" in the case of Achilles, or "Saturnia" in the case of the goddess Juno in Virgil's "Aeneid", is specifically called a patronymic device and is in its own class of epithet.