(idiomatic) just right, most suitable / bring me...

historic, historical / already-happened, past / former, old, traditional

historian

study of history

(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

oral history

historicism

Inner Mongolia (an autonomous region of China)

Outer Mongolia

Kyūjitai form of 旧字体: kyūjitai (traditional form of Japanese kanji used before 1947)