Felonia

…violation of the duty of good faith between a lord and a vassal in a feudal relationship (feudal system). In Latin, felonia. In a feudal relationship, a lord and a vassal have a mutual duty of good faith toward each other, that is, a basic duty to actively seek the interests of the other party and avoid disadvantages. In addition, the lord has a duty to protect his vassal by granting him fiefs (lanes), and the vassal has a duty to serve in the military, attend court, etc.

*Some of the terminology that mentions "felonia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…封建的主従関係(封建制度)における主君と家臣の間の誠実義務違反。ラテン語でフェロニアfelonia。封建的主従関係にある主君と家臣とは，相手方に対し誠実をつくす義務，すなわち，積極的に相手方の利益を図り不利益を避ける基本的な義務を相互に負うほかに，主君は封地(レーン)等を与えて家臣を保護する義務を，また，家臣は主君に対し軍役，参廷等の義務を負う。…

※「felonia」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