その昔むかし

expression

a long time ago; in those days

A set phrase used adverbially to refer to a distant past, often at the beginning of a story or reminiscence. Slightly literary or nostalgic in tone.

• その昔むかし、この村むらには大おおきな城しろがあった。

  A long time ago, there was a big castle in this village.

• その昔むかしは、携けい帯たい電でん話わなんてなかった。

  In those days, there were no mobile phones.