History and geography Why did the ancient capital move?

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History and Geography : Ancient History Begins in Asuka-no-Chi (Asuka-no-Chi), then goes through Naniwa Nagara-Toyosaki Palace to Heijo-kyo (Nara-Kyo) and Heian-kyo (Kyoto-Kyo), which are still popular as Japanese "ancient capitals." The "capital", the center of the ancient nation, has changed its location many times since the reign of Empress Suiko. Why was that? By making full use of the remarkable excavation results in recent years, materials on excavated characters, and historical documents, the actual state of the capital and its changes are carefully followed.