History and geography The Ancient Capital Why did it move?

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History and Geography
Opening the Ancient History / Starting in Asuka, passing through Naniwa no Miya Palace, Heijo-kyo (Nara), which is still familiar as the "Ancient Capital" of Japan, and Heian-kyo (Kyoto). The capital, the center of the ancient state, has changed its location many times since the era of Empress Suiko. Why was that? By making full use of the outstanding excavation results in recent years, full use of the remarkable excavation results in recent years, unearthed written materials and historical materials.