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Emperor Constantine the Great was a life-long devotee of the cult of Sol Invictus (the Invincible Sun), and he cleverly deflated the natural liberation movement by applying its signature names and phrases to the core elements of the Roman Imperial cult. So doing he diverted its painstakingly wrought social energies into a revived version of the time honored paganism of Rome. The pantheon of demigods now became called saints (deified humans), the divine and elite political hierarchy was dubbed clergy, amulets became icons, magic chants became prayers, spells became blessings and invocations curses, and of course the divine representative of the
Pantokrator was the holy emperor himself! The world of the Lord of Life is based on natural economy and thus diversity (Galatians 2:11) but Constantine turned it into a graven image that grew ever more rigid; Christianity's library of immutable doctrines took the place of Rome' rows of marble idols.
Thanks to Constantine and his councils, creeds and exclusive canon (which blatantly opposed
Paul's inclusive assertion that
all writing is θεοπνευστος,
theopneustos; 2 Timothy 3:16), the detrimental atheism of the liberation movement became the wholly dependable monotheistic religion of imperial Christianity. And although the deception worked like a miracle, it needed some nifty folklore to get really going.
The search for the "historical Jesus" pretty much started with Constantine's mother Helena, who lived two and a half centuries after Mary and Jesus of Nazareth but still managed to unearth the one and only true cross of Christ. This is remarkable since hundreds of thousands of people had been crucified in the century of Jesus and crosses were recycled until they fell apart. Even more remarkable, the one and only true cross of Christ still had the Titulus Crucis — the plaque that declared Jesus' regality in Hebrew, Greek and Latin — attached to it, which Helena duly purloined and carried home in lucrative triumph.
Though Helena is still widely venerated for her efforts, the story is really rather absurd and shows very little sensitivity to both the nature of the original Jesus movement and the wholesale destruction of the Jewish world in the years following 70 AD. But then, neither Constantine nor Helena cared much about the actual gospel and were mostly interested in extending the emperor cult some badly needed divine swagger. Both Jesus and Constantine came from humble origins, and both Mary and Helena had been abandoned by their husbands (which conveniently explained why there's no Joseph at Golgotha). The whole Jesus-son-of-Mary thing matched the Constantine-son-of-Helena thing like a glove and demonstrated beyond the need for further investigation that Constantine was destined to be the vestige of whichever god on earth.
Much of our intuitive and folkloristic understanding of the Bible comes from the traditional church, which is a post-Constantinian Roman institution and has nothing to do with the gospel of Jesus Christ and everything with Roman Imperialism. Subsequently, the traditional church has had very little reason to preserve or even reflect the concerns of the Bible authors, and has always been nearly wholly invested in forwarding the pagan models that keeps flocks conveniently fearful and compliant. In political Rome family ties were hugely important and the early formal church built its mythology on the assumption that the mother and (half-) brothers of Jesus must have been at least half as holy as he, and certainly automatically part of Jesus' missionary apparatus, since he, just like any Roman Caesar, would surely surround himself with siblings and cousins.
In the Bible, of course, things work quite the opposite and nobody gets any glory on account of a famous brother (or else we would have heard more from the brothers of David). Jesus even literally explained that whoever did the will of his Father was his brother and sister and mother (Matthew 12:50), and the Biblical Marian character reflects precisely that.
The Titulus Crucis
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http://www.abarim-publications.com/Meaning/Mary.html#.W1ox6tJKiUk