the sky, the heavens / heaven / (Buddhist god) a deva or devi / (figuratively) the gods, providence, fate / (printing, of a page) the top margin

the Eiroku era, 1558-1570

oral history

historicism

historian

(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

study of history

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

(history) the Nara period (710 - 794 CE)

an ice age (period of glaciation at the poles)