In Greek mythology, Autochthon () was one of the ten sons of Poseidon and Cleito in Plato's myth of Atlantis.Plato, Critias 113d His name means "sprung from the land itself" which can be attributed to his grandfather Evenor who was an autochthon and one of original inhabitants of the land.
Family Autochthon was the younger brother of Mneseus and his other siblings were Atlas and Eumelus, Ampheres and Evaemon, Elasippus and Mestor, and lastly, Azaes and Diaprepes.Plato, Critias 114a-c
Mythology Autochthon, along with his nine siblings, became the heads of ten royal houses, each ruling a tenth portion of the island, according to a partition made by Poseidon himself, but all subject to the supreme dynasty of Atlas who was the eldest of the ten.Plato, Critias 114d
Notes
References
Plato, Critias in Plato in Twelve Volumes, Vol. 9 translated by W.R.M. Lamb. Cambridge, Massachusetts, Harvard University Press; London, William Heinemann Ltd. 1925. Online version at the Perseus Digital Library. Greek text available at the same website.