(Greek myth) a king of Thrace, who arrived in the tenth year of the Trojan War to aid Troy. Odysseus and Diomedes stole his horses because an oracle had said that if these horses drank from the River Xanthus, Troy would not fall
1827, from Mod.L. genus name of a type of E. Indian monkey (1799), given by Fr. naturalist Jean-Baptiste Audebert (1759-1800), said to be an arbitrary use of L. Rhesus, name of a legendary prince of Thrace, from Gk. Rhesos.