But Achæans and Dorians were not alone in shaping and sharing Mycenæan culture; they had their congeners in other regions. Foremost among these were the Minyan founders of Orchomenos. As lake-dwellers and hydraulic engineers they are assimilated to the Danaans, whose near kinsmen they may have been, as the primitive islanders, whose abode we have found copied in the stone vases, must have been related to them both. Tradition has, in fact, preserved an account of the colonisation of Thera by a people coming from Bœotia, although it is uncertain whether it refers to the original occupation or to a settlement subsequent to the great catastrophe.
From the Danao-Minyan stock, it would appear that the Achæans parted company at an early date and continuing for a time in a different—most probably a mountainous—country, there took on ways of living proper to such environment. Later than the Danaans, according to the consistent testimony of tradition, they came down into the Peloponnesus and by their superior vigour and prowess prevailed over the older stock.
To these two branches of the race we may refer the two classes of tombs. The beehive and chamber tombs, as we have seen, have their prototype in the sunken huts: they belong to the Achæans coming down from the colder north. The shaft-graves are proper to the Danaan marsh-men. At Tiryns we find a shaft-grave, but no beehive or chamber tomb. At Orchomenos the Treasury of Minyas stands alone in its kind against at least eight
There is but one theory on which these facts can be fully explained. It is that of a change in the ruling race and dynasty, and it clears up the whole history of Mycenæ and the Argive Plain. The first Greek settlers occupied the marshy sea-board, where they established themselves at Tiryns and other points; later on, when they had learned to rear impregnable walls, many of them migrated to the mountains which dominated the plain and thus were founded the strongholds of Larissa, Midea, and Mycenæ.
But while the Danaans were thus making their slow march to the north the Achæans were advancing southward from Corinth—a base of great importance to them then and always, as we may infer from the network of Cyclopean highways between it and their new centre. At Mycenæ, already a strong Perseid outpost, the two columns meet—when, we cannot say. But about 1500 B.C., or a little later, the Achæans had made themselves masters of the place and imposed upon it their own kings.
We have no tradition of any struggle in connection with this dynastic revolution, and it appears probable that the Achæans did not expel the older stock. On the contrary, they scrupulously respected the tombs of the Danaid dynasty—it may be, because they felt the claim of kindred blood. In manners and culture there could have been but little difference between them, for the Achæans had already entered the strong current of Mycenæan civilisation.
Indeed, we discern a reciprocal influence of the two peoples. Within certain of the Achæan tombs (as we may now term the beehives and rock chambers) we find separate shaft-graves, obviously recalling the Danaid mode of burial. On the other hand, it would appear that the typical Achæan tomb was adopted by the ruling classes among other Mycenæan peoples. Otherwise we cannot explain the existence of isolated tombs of this kind as at Amyclæ (Vaphio), Orchomenos, and Menidi—obviously the sepulchres of regal or opulent families; while the common people of these places—of non-Achæan stock—buried their dead in the ordinary oblong pits.