Ariston was a king of Sparta, 14th of the ancient lineage of
the Eurypontidae, son of Agesicles, contemporary of Anaxandrides. He
ascended the Spartan throne before 560 BC, and died not long after,
510 BC.
He thus reigned about 50 years, and was of high
reputation, of which the public prayer for a son for him, when the
house of Procles had other representatives, is a testimony.
Demaratus, hence named, was borne him, after two barren marriages,
by a third wife, whom he obtained,
it is said, by a fraud from her husband, his
friend, Agetus. before King Ariston married the queen who gave birth
to Demaratos, he had two previous wives with whom he had failed to
produce children. Ariston, dismissed one of the other two.
~Article courtesy of: WikipediA
-by Phryne Ictinus