Pausanias Description of Greece 3.16.6

[6]
  The Lacedaemonians have also made a sanctuary for Lycurgus, who drew up the laws, looking upon him as a god. Behind the temple is the grave of Eucosmus, the son of Lycurgus, and by the altar the grave of Lathria and Anaxandra. Now these were themselves twins, and therefore the sons of Aristodemus, who also were twins likewise, took them to wife; they were daughters of Thersander son of Agamedidas, king of the Cleonaeans and great-grandson of Ctesippus, son of Heracles. Opposite the temple is the tomb of Theopompus son of Nicander, and also that of Eurybiades, who commanded the Lacedaemonian warships that fought the Persians at Artemisium and Salamis . Near is what is called the hero-shrine of Astrabacus.

[6] The Lacedaemonians have also made a sanctuary for Lycurgus (Lykourgos), who drew up the laws, looking upon him as a god. Behind the temple is the tomb of Eukosmos, the son of Lycurgus (Lykourgos), and by the altar the tomb of Lathria and Anaxandra. Now these were themselves twins, and therefore the sons of Aristodemos, who also were twins likewise, took them to wife; they were daughters of Thersandros son of Agamedidas, king of the people of Kleonai and great-grandson of Ktesippos, son of Hēraklēs. Opposite the temple is the tomb of Theopompos son of Nikandros, and also that of Eurybiades, who commanded the Lacedaemonian warships that fought the Persians at Artemisium and Salamis. Near is what is called the hero-shrine of Astrabacus.