Ie Nao, Lord of Iizasayama Castle

…There are various theories about his birth year. He was originally called Iesan Yamashiro no Kami Ienao, and was closely connected to both Kashima and Katori Shrines. He is said to have been given the divine title of Tenshinsho. As a comprehensive martial art centered on sword and spear techniques, he is considered the origin of many later martial arts. …

*Some of the terminology that refers to "Iizasayama Castle Lord Ienao" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…生年には諸説あり。はじめ飯篠山城守家直といい，鹿島，香取両神宮にゆかり深く，神授を受けて天真正を冠したといわれる。刀槍（とうそう）の術を中心とした総合武術として後代の諸武術の源流的存在。…

※「飯篠山城守家直」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報