Iami

...The prototype is considered to be the representative temple and shrine performing art "Ennen" from the Kamakura period, and current Noh plays such as "Shari", "Dairokuten" and "Dai-e" can be said to be relatively faithful descendants of it. There are signs of the appearance of human asura in Zeami's obsession-related plays, especially in "Nue", which is a devilish play, and the pattern of a warrior falling into the world of asura and suffering because of his obsession begins directly in "Michimori", which Zeami adapted from the original by Iami. Zeami's "asura" is somewhat inconsistently conceptualized as an ancient asura and a human asura, and in "Fushikaden" and "Shura", "Although it is well-known, it is rare to find something interesting" refers to the former, and "However, famous people such as Genpei are created based on the characters of flowers, birds, wind and moon" refers to the latter. ...

*Some of the terminology explanations that mention "Iami" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…鎌倉時代の代表的寺社芸能〈延年〉に原型とみられるものがあり，現行能の《舎利》《第六天》《大会（だいえ）》などは，それに比較的忠実な末流ということができる。世阿弥の執心物，ことに，鬼畜物ではあるが《鵺（ぬえ）》あたりに人間修羅の出現する兆しがあり，直接には，井阿弥（いあみ）の原作を世阿弥が改作した《通盛（みちもり）》に，武者がその執心ゆえに修羅道に落ちて苦しむというパターンが始まる。世阿弥のいう〈修羅〉は，古態の修羅と人間修羅とがやや不統一に概念づけられており，《風姿花伝》〈修羅〉にいう〈よくすれども，面白き所稀（まれ）なり〉とは前者，〈但し，源平などの名のある人の事を，花鳥風月に作り寄せて〉とは後者である。…

※「井阿弥」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