The true original family

Was the Mikaelson the real original family? what if they weren't the true original family had long since stopped interfering in supernatural matters and lived life in their castle together when the Mikaelsons were turned they did nothing, looking down on the ones who assumed their name with pitty, but what would happen when a witch who knew the truth managed to summon a member of the true original family to Mystic falls in hopes of fighting against the Mikaelsons