Oh, check out Holy Blood, Holy Grail, partially in reference to the Council of Nicaea and both decided which of those many many apocrypha would be considered acceptable, and which miracles & stories from eastern religions under byzantine/persian control would find a home in the west, such as the virgin birth, a spear in the side spurting out water, etc.

Also must don't realize Alexander was basically a Cyrus II copier/plagiarist took territories almost exact, while the Romans overrode Phoenician/Carthaginian history to make the African side look like wimps rather than a pretty kickass tribe finally razed by these new upstart Roman fascist control freaks, and the the Romans took over Greece and co-opted all its symbolism and history as fit, including gods - a much more thorough job than the Germans did with their mystical mythical dabbling 2 millennia later.

Anyway, Nicaea's where Constantine embraced Christianity, to make himself the Sun king and God's personal emissary on earth, Jesus 2.0 - the original Louis XIV with a bigger ego and greater territorial/religious ambitions.