Man of Honour
As an actual technique, it came about at some point shortly after the invention of the lecture... so probably Ancient Greek times, I'd say. [..]
I think gesturing during speech as a learned technique probably predates lectures in teaching because it's useful in politics and trading and it's based on natural movements. For those reasons, I think it wouldn't have been overlooked for so long.
Edit: Perhaps what goes back to ancient Greek universities is the oldest surviving written teaching material for the use of body language.
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