Soos (Greek: Σόος) was a partially mythological king of Sparta. According to Pausanias son of Procles and father of Eurypon. His name means stability, a key concept for Spartan identity — such personifications of concepts are typical of orally transmitted lists. During his rule Spartans took away freedom of Helots, and took to themselves some territories of Arcadia.Plutarch wrote that once Clitorians encircled Spartans, preventing their access to water sources.