Did Socrates, Plato and Aristotle really exist?

All that we know about these three was written 1000 years after they died. Maybe they were just part of Greek mythology. After all, what we know about Jesus the Christ was written within 100 years of His death and written by eyewitnesses such as John and Matthew, men who really knew Him and spoke to Him. Yet I... show more All that we know about these three was written 1000 years after they died. Maybe they were just part of Greek mythology. After all, what we know about Jesus the Christ was written within 100 years of His death and written by eyewitnesses such as John and Matthew, men who really knew Him and spoke to Him. Yet I see many claiming that since all the writings are after Jesus died they can't be trusted. Why the double standard?
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