In recent years, there has been a noticeable and enthusiastic increase of interest in Buddhist temples and Shinto shrines in Japan. The legends of these temples and shrines are recorded in many historical manuscripts and these genealogies have such great significance that some of them have been registered as national treasures of Japan. They are indispensable to elucidate the history of these temples and shrines, in addition to the formation process of the ancient Japanese nation. This book provides a comprehensive examination of the genealogies and legends of ancient Japanese clans. It advances the study of ancient Japanese history by utilizing new analytical perspective from not only the well-known historical manuscripts relied upon by previous researchers, but also valuable genealogies and legends that previous researchers largely neglected.