FORMERLY, previously, in days/years/times gone by, in former times, in the (good) old days, in days of old, in olden times, once (upon a time); poetic/literary in days of yore, in yesteryear.
2192; headword
IN THE PAST
Meaning of IN THE PAST in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012