Genji Shogun Danzetsu Naze Yoritomo No Chi Ha San Dai De Todaeta Ka (PHP Shinsho)

[Machine Translation] In the Kamakura shogunate, the first full-fledged samurai government in Japanese history, the Minamoto clan lineage of its founder, Yoritomo, ceased after three generations and was not succeeded. The assassination of the third shogun, Sanemasa, who had no heir, is said to have caused this break in the line. At that time, there were also orphans of the second shogun, Yorike, and others of the Minamoto clan. Why were they not able to become shoguns? Is it self-evident that the assassination of Minamoto no Yoritomo led to the end of the Minamoto shogunate? This book examines the historical significance of the breakdown of the Minamoto shoguns by unraveling the history of the fierce power struggle within the shogunate, from the establishment of the Kamakura shogunate by Yoritomo to the murder of the third shogun, Minamoto no Sanemoto.

日本史上初の本格的な武家政権である鎌倉幕府では、創設者頼朝の源氏の血統は三代で途絶え、継承されなかった。跡継ぎのいなかった三代将軍実朝の暗殺がこの「断絶」を招いたとされるが、その当時、二代将軍頼家の遺児、あるいは他の源氏の血を引く人々も存在した。にもかかわらず、なぜ彼らは将軍になれなかったのか。そもそも実朝の暗殺が源氏将軍の断絶を招いたのは、自明の理なのか。本書では頼朝による鎌倉幕府の樹立から三代将軍実朝の殺害に至るまで、幕府内の壮絶な権力闘争の歴史を紐解きながら、「源氏将軍断絶」の歴史的な意味を問い直す。