This is a twist on the "If a tree falls in the woods" question: Certainly there lived in the past a person, but the person in question has some very typical attributes: Nothing was written about or by this person. The person in question made no lasting contributions or left any tangible artifacts. No-one living has any memory of this person, nor are there any stories, legends, or tales being told. Did this person ever exist even with no known qualities, age, timeframe, or attribute other than "a human in the past?" There may well have been the faceless masses that are written about and populate historical accounts and ancient Greek plays, but what about specific but unspecified persons? They must have existed, but did they exist as individuals or only as a type?