importance

(historical) wokou (pirates from a mixture of ethnicities who raided the coastlines of China and Korea from the 13th to 16th centuries)

stairs used in emergencies

state of emergency (unusually difficult or dangerous situation)

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