I thought The Wheel (or Sphere) of Pythagoras was the oldest Book of Fate I was ever going to find. Then along came ‘The Oracles of Astrampsychus.’ Dating roughly from around the second century A.D./C.E., The Oracles of Astrampsychus was originally a product of pagan Greek society. It’s not known who first composed it or when, the name Astrampsychus likely being a pseudonym. The Introduction in this oracle states it was a product of Pythagoras himself, who was also credited as being the author of the self-named ‘Wheel(orSphere) of Pythagoras’, but again, that is unprovable.
What can be clearly asserted is The Oracles of Astrampsychus is about 1800 years old, 800 years older than The Wheel (Sphere) of Pythagoras. At some point, apparently the fourth century A.D./C.E., early Christians got ahold of The Oracles of Astrampsychus and revamped it for a specifically Christian audience. Early Christians, in their religious zeal, either converted Pagan things to Christian purposes or destroyed them, so clearly they saw some value in this oracle. The original Pagan Greek version had a few more risqué questions, which the nameless early Christian editor changed to more chaste Christianized questions. The document stayed substantially the same, though, and there are a few things about this oracle which persuade me it is as old as claimed.