Hence it is a picture of the imagination which, since Herodotus,[e] has been accepted as primitive Grecian history. But the problem which gave rise to the traditions of mythical migrations still remains for us to solve--the question as to why the epics present us with a different picture of the distribution of Grecian tribes, from that found in historic times. The answer to-day will naturally be different from the one given two thousand years ago. The epic poem designates Agamemnon’s followers, and indeed all the Greeks before Troy, as Argives, Achæans, or Danaans--terms which are used wholly synonymously even in the oldest parts of the _Iliad_. Now we know that not only in Homeric times, but already centuries earlier, before the colonisation of Crete and Asia Minor, Argolis was inhabited by the same people that we find there in historic times. It would not of itself be impossible to suppose that this people, who afterwards had no common tribal name, should have called themselves Achæans or Danaans, in prehistoric times, although it would be difficult to understand how this tribal name could have been lost. But as a matter of fact a tribe called Danaan never did exist. Danaus is an old Argive hero who is said to have transformed the waterless Argos into a well-watered country; his daughters, the Danaides, are water nymphs; Danæ also, the mother of the solar hero Perseus, and herself a goddess, cannot be separated from Danaus. The Danaans, accordingly, are the “people of Danaus”; they belong like him to tradition, and have been transposed from heaven to earth like the Cadmeans and Minyæ to whom we shall return later on. The name Achæan, however, was applied in historic times to the inhabitants of the northern coast of the Peloponnesus and of the south of Thessaly, and it is hardly probable that it should have been more widely spread in historic times. Agamemnon seems rather, according to the oldest tradition, to have been a Thessalian prince, like Achilles, who continued to be regarded as such. At the time, however, when the epic was being formed in Ionia, the Peloponnesian Argos outshone all other parts of the Grecian peninsula, and the poets in consequence were obliged to transpose the governmental seat of the powerful ruler from Thessaly to the Peloponnesus. His Achæans of course migrated with him.