1640s (n.); 1690s (adj.), in reference to followers or doctrines of Faustus Socinus, Latinized name of Fausto Sozzini (1539-1604), Italian anti-trinitarian theologian who held Christ to be human, if divinely endowed, and the Holy Spirit to be divine energy, not a person. He broke with the Church and organized the Polish Brethren.

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