olden russian

• и́здавна

  long since, since olden times

• издре́вле

  of yore, from of old, since olden days

• встарь

  in olden times, formerly, in olden days, of old

• и́сстари

  from olden times

Examples

• В дре́вности футбо́л был популя́рен и в Гре́ции, и в Ри́ме.In olden times, football was popular in both Greece and Rome.
• Но где снега былы́х времён?But where are the snows of olden days?