if pythagoras didn't exist

would the greeks have had to invent him?

There seems to be a disburbing notion that Pythagoras may not actually have have been a real person.

And that the theorem about the square on the hypotenuse (being equal to the sum of the squares on the two adjacent sides) was known, understood and probably proved in as-yet untranslated cuneiform texts by the Babylonians long before Pythagoras came onto the scene 2500 years ago.

All I need now is for someone to tell me Santa doesn't exist and that's my world finished...