Since Socrates himself never wrote anything down, the only way we know about him

Since Socrates himself never wrote anything down, the only way we know about him

Since Socrates himself never wrote anything down, the only way we know about him now is from the writings of his student Plato. But if that's the case, then how do we know that Socrates was an actual person, and not just a figment of Plato's imagination. Is there any evidence of Socrates independent of Plato's writings.

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