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 _tholoi_ and sixty chamber-tombs at Mycenæ. Hence, wherever this type of tombs abounds we may infer that an Achæan stock had its seat, as at Pronoia, in Attica, Thessaly, and Crete. Against this it may be urged that precisely at the Achæan capital, and within its acropolis at that, we find the famous group of shaft-graves with their precious offerings, as well as humbler graves of the same type outside the circle. But this, in fact, confirms our view when we remember it was the Danaid Perseus who founded Mycenæ and that his posterity bore rule there until the sceptre passed to Achæan hands in the persons of the Pelopidæ.[5] We have noted the close correspondence of the original fortress at Mycenæ with that of Tiryns, and its subsequent enlargement. Coincident with this extension of the citadel, the new type of tomb makes its appearance in the great domes,--some of them certainly royal sepulchres,--although the grave-circle of the acropolis is but half occupied. That circle, however, ceases thenceforth to be used as a place of burial, while the humbler graves adjacent to it are abandoned and built over with dwellings. With the new type of tomb we note changes of burial customs, not to be accounted for on chronological grounds: in the beehive tombs the dead are never embalmed, nor do they wear masks, nor are they laid on pebble beds--a practice which may have owed its origin to the wet ground about Tiryns. 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.