(1684) Dione (dye-oe'-nee) is a moon of Saturn discovered by Giovanni Cassini in 1684. It is named after the titan Dione of Greek mythology who (with Zeus) created Aphrodite. It is also designated Saturn IV.
http://en.wikipedia.org/wiki/Dione_(moon)
Description:
(1685) Tethys is a moon of Saturn that was discovered by Giovanni Domenico Cassini in 1684. Tethys is named after the titan Tethys of Greek mythology. It is also designated Saturn III or S II Tethys.