Charles Buck Theological Dictionary
So called from Berylius, an Arabian, bishop of Bozarth, who flourished in the third century. He taught that Christ did not exist before Mary; but that a spirit issuing from God himself, and therefore superior to all human souls, as being a portion of the divine nature, was united to him at the time of his birth.
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Buck, Charles. Entry for 'Beryllians'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/b/beryllians.html. 1802.