Plato tells us that the dominion of Gadeirus, one of the kings of Atlantis, extended "toward the pillars of Heracles (Hercules) as far as the country which is still called the region of Gades in that part of the world." Gades is the Cadiz of today, and the dominion of Gadeirus embraced the land of the Iberians or Basques, their chief city taking its name from a king of Atlantis, and they themselves being Atlanteans.
To his twin brother, who was born after him, and obtained as his lot the extremity of the island towards the Pillars of Heracles, facing the country which is now called the region of Gades in that part of the world, he gave the name which in the Hellenic language is Eumelus, in the language of the country which is named after him, Gadeirus.
Gadeirus, also called Eumelus in Greek, holds the extremity toward the Pillars of Heracles, facing the later region of Gades.
Eumelus (Gadeirus in some translations)
Plato's account of Gadeirus, ruling a region extending to what is now Spain, implies that the Basques could be descendants of Atlanteans.