Illuminati

"Illuminati, Greek illumination, name given to those who submitted to Christian baptism. Those who were baptized were called "illuminati" or "illuminated ones" by the Ante-Nicene clergy, on the assumption that those who were instructed for baptism in the Apostolic faith had an enlightened understanding.

The Alumbrados, a mystical 16th-century Spanish sect, were among the societies that subsequently adopted the name illuminati. Later, the title of illuminati was used by a secret society founded by Adam Weishaupt that aimed to combat religious thinking and encourage rationalism."