Jupiter (mythology) practice of swearing by Jove to witness an oath in law courts is the origin of the expression "by Jove!"—archaic, but still in use. The name of the god was also adopted as the name of the planet Jupiter; the adjective "jovial" originally described those born under the planet of Jupiter (reputed to be jolly, optimistic, and buoyant in temperament). Jove was the original namesake of Latin forms of the weekday now known in English as Thursday (originally called "Iovis Dies" in Latin). These became "jeudi" in French, "jueves" in Spanish, "joi" in Romanian, "giovedì" in Italian, "dijous" in Catalan,
Proserpine (play) Proserpine. Ceres appeals to Jove for assistance, and Iris appears, saying that Proserpine's fate is fixed. However, Jove agrees that if Proserpine does not eat the food of the Underworld, she can return. The group leaves to fetch Proserpine, who believes she has not consumed any tainted food, but she is reminded by Ascalaphus, a shade of the Underworld, of some pomegranate seeds that she ate. Ceres, Ino, and Arethusa volunteer to exile themselves to the Underworld, taking their treasures, such as fertility, with them. However, their sacrifice is not permitted. Iris relates Jove's decision regarding Proserpine's fate: Ceres promises