The contrast between the forms of dress represented in Mycenæan art and in the Homeric poems can only be explained by supposing that there is a difference in race between the two peoples, and that the older civilization was almost entirely swept away by a great series of invasions carried out by men of a different race. The Homeric dress is closely akin to that of the Greeks of the classic period, whereas that represented on Mycenæan rings and gems belongs, as will be shown later, to the stratum of civilization revealed by the Cretan excavations.[2] We must suppose, then, that the Homeric heroes belonged to the invading race, which was full of youthful vigour and succeeded in superimposing its manners and customs upon those of the older, decadent society, and in finally ousting the older inhabitants from their homes altogether. The process was one which must have lasted over some centuries, and it is probable that the Homeric poems were composed whilst it was still incomplete, and that the siege of Troy represents one incident in the long wars which were waged between the two peoples. This view accounts for the fact that the Homeric house belongs to the older civilization, while the costume is that of the later. The invaders, having conquered or driven out the inhabitants, finding their houses strongly built and luxuriously decorated, would refrain from destroying them and settle themselves peacefully and comfortably there, naturally retaining their own style of dress and customs of disposing of their dead. Any new houses built after their settlement would be constructed after their own plans, and so the Homeric house would gradually give place to the Hellenic. The absence of brooches and fibulæ from the graves on the Acropolis of Mycenæ, and their presence in those of the lower city, adds confirmation to this theory. The Acropolis graves are earlier than the others, which in all probability belong to the time when the invaders had already imposed some of their characteristic customs upon their predecessors at Mycenæ and elsewhere in Greece. The use of the fibula is common to the early peoples of Central Europe, from which region it must have been introduced by the Achæan invaders into Greece.[3] [2] Cp. Busolt, _Griechische Geschichte_, vol. i., 2nd ed., chap. i. [3] Ridgeway, _Early Age of Greece_, chap. viii.; S. Müller, _Urgeschichte Europas_, pp. 95, 96.