470 - 399 BC: Socrates:

470 - 399 BC: Socrates: "The deaf express themselves in gestures..."

Socrates quoted by Plato in "Cratylus" mentions the deaf who express themselves in gestures movement, depicting that which is light or a higher sphere by raising the hands or describing a galloping horse by imitating its motion.

Socrates was a Greek philosopher from Athens who is credited as one of the founders of Western philosophy, and as being the first moral philosopher of the Western ethical tradition of thought.

Source: https://en.wikipedia.org/wiki/Socrates

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