to Livingman:
No the spartan kings were decendant from heracles (hercules in Rome)
to XinXin89:
The dioscouri were one of the most common subjects of Spartan art. The 'Heavenly Twins', brothers Castor and Polydeuces, were Spartan princes and the siblings of helen of Troy. One brother was the child of Zeus, like helen, and the other of Tyndareus (sorry i don't know who he is). Only one brother could have the immortality of the gods so, rather than the other die, the twins shared their immortality. The greeks believed the twins were eventually placed among the stars as the Gemini starsign.
The spartans believed the brothers still lived close to Sparta and assisted their former city in time sof danger.
i hope this helps you.