Do we have a guess at when Gargauth was exiled…

Do we have a guess at when Gargauth was exiled from Baator?

do we have a guess at when Gargauth was exiled from Baator? Seems to me like it was *at least* a couple thousand years before Dale Reckoning That’s probably a good guess, because Gargauth has been meddling in human affairs in Faerûn for a long, long time.