Eurypon, otherwise called Eurytion (Ευρυπών, Ευρυτίων), son of Soos

Soos

Soos 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...

 and grandson of Procles

Procles

In Greek legend, Procles was one of the Heracleidae, a great-great-great-grandson of Heracles, and a son of Aristodemus and Argia. His twin was Eurysthenes. Together they received the land of Lacedaemon after Cresphontes, Temenus and Aristodemus defeated Tisamenus, the last Achaean king of the...

, was the third king of that house at Sparta

Sparta

Sparta or Lacedaemon, was a prominent city-state in ancient Greece, situated on the banks of the River Eurotas in Laconia, in south-eastern Peloponnese. It emerged as a political entity around the 10th century BC, when the invading Dorians subjugated the local, non-Dorian population. From c...

, and thenceforward gave it the name of Eurypontidae.

Plutarch

Plutarch

Plutarch then named, on his becoming a Roman citizen, Lucius Mestrius Plutarchus , c. 46 – 120 AD, was a Greek historian, biographer, essayist, and Middle Platonist known primarily for his Parallel Lives and Moralia...

 talks of his having relaxed the kingly power, and played the demagogue; and Polyaenus

Polyaenus

Polyaenus or Polyenus vs. e]]; , "many proverbs") was a 2nd century Macedonian author, known best for his Stratagems in War , which has been preserved. The Suda calls him a rhetorician, and Polyaenus himself writes that he was accustomed to plead causes before the emperor...

 relates a war with the Arcadia

Arcadia

Arcadia is one of the regional units of Greece. It is part of the administrative region of Peloponnese. It is situated in the central and eastern part of the Peloponnese peninsula. It takes its name from the mythological character Arcas. In Greek mythology, it was the home of the god Pan...

ns of Mantineia

Mantineia

Mantineia was a city in ancient Greece that was the site of two significant battles in Classical Greek history. It is also a former municipality in Arcadia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Tripoli, of which it is a municipal unit. Its seat...

 under his command. He was succeeded by his son Prytanis, the father of Polydectes, in turn father of Eunomus (father of Charilaus

Charilaus

Charilaus, also given as Charillus, was a king of Sparta in the early-mid 8th century BC. He is generally shown as the successor of his grandfather Polydectes, though Pausanias implies that Charilaus' father Eunomus preceded Charilaus....

) and Lycurgus.