The Secret History of Pythagoras with the subtitle – Translated from the original copy lately found a Otranto in Italy claims to tell the true story about Pythagoras life. This book was written/translated by Samuel Croxall and printed in England in 1751, but you will have no problem reading it, just remember that “s” inside and in the beginning of word looks like “f”. From the intro:
The Translation of this venerable Piece of Antiquity is undertook upon a double Score; being designed as well to entertain the Curiosity of the Learned, as to supply the Defects of the Ignorant.
Download The Secret History of Pythagoras here (70 pages/8.4Mb):