Pythagoras did not discover the theorem, it's just named after him. He may have been the first to record a proof of it. It's conceivable that the very first peoples to become seriously interested in geometrical calculation would have discovered it as a matter of course. It does meet the definition of timelessness whereas Lisp does not.

As Wikipedia notes: "Mesopotamian, Indian and Chinese mathematicians are all known to have discovered the theorem independently and, in some cases, provide proofs for special cases."