You remember that after a hundred years the grandsons of Hercules returned, bringing with them their followers of Dorian birth, and conquered Laconia.  These Dorians called themselves Spartans, and were the rulers of the land, though the Greeks, who were there before them, were also freemen, all but those of one city, called Helos, which revolted, and was therefore broken up, and the people were called Helots, and became slaves to the Spartans.  One of the Spartan kings, sons of Hercules, had twin sons, and these two reigned together with equal rights, and so did their sons after them, so that there were always two kings at Sparta.  One line was called the Agids, from Agis, its second king; the other Eurypontids, from Eurypon, its third king, instead of from the two original twins.