In the first place why are they called 'Olympian'? Are they the Gods of Mount Olympus, the old sacred mountain of Homer's Achaioi, or do they belong to the great sanctuary of Olympia in which Zeus, the lord of the Olympians, had his greatest festival? The two are at opposite ends of Greece, Olympus in North Thessaly in the north-east, Olympia in Elis in the south-west. From which do the Olympians come? On the one hand it is clear in Homer that they dwell on Mount Olympus; they have 'Olympian houses' beyond human sight, on the top of the sacred mountain, which in the _Odyssey_ is identified with heaven. On the other hand, when Pisistratus introduced the worship of Olympian Zeus on a great scale into Athens and built the Olympieum, he seems to have brought him straight from Olympia in Elis. For he introduced the special Elean complex of gods, Zeus, Rhea, Kronos, and Gê Olympia.[45:1] Fortunately this puzzle can be solved. The Olympians belong to both places. It is merely a case of tribal migration. History, confirmed by the study of the Greek dialects, seems to show that these northern Achaioi came down across central Greece and the Gulf of Corinth and settled in Elis.[45:2] They brought with them their Zeus, who was already called 'Olympian', and established him as superior to the existing god, Kronos. The Games became Olympian and the sanctuary by which they were performed 'Olympia'.[45:3] As soon as this point is clear, we understand also why there is more than one Mount Olympus. We can all think of two, one in Thessaly and one across the Aegean in Mysia. But there are many more; some twenty-odd, if I mistake not, in the whole Greek region. It is a pre-Greek word applied to mountains; and it seems clear that the 'Olympian' gods, wherever their worshippers moved, tended to dwell in the highest mountain in the neighbourhood, and the mountain thereby became Olympus. The name, then, explains itself. The Olympians are the mountain gods of the old invading Northmen, the chieftains and princes, each with his _comitatus_ or loose following of retainers and minor chieftains, who broke in upon the ordered splendours of the Aegean palaces and, still more important, on the ordered simplicity of tribal life in the pre-Hellenic villages of the mainland. Now, it is a canon of religious study that all gods reflect the social state, past or present, of their worshippers. From this point of view what appearance do the Olympians of Homer make? What are they there for? What do they do, and what are their relations one to another?