Sabellius 

Sabellius (fl. c. 215) taught a form of ‘modalism’, in which God was one divine indivisible person, yet manifested in three modes, the Father, Son, and Holy Spirit. God revealed himself as the Father in creation, the Son in redemption; and the Holy Spirit in sanctification and regeneration. Sabellius was at odds with the trinitiarianism of his day and was excommunicated as a heretic by Pope Calixtus I in 220. Sabellian theology resurfaced among several protestant sects in the seventeenth and eighteenth centuries, joining with Arianism and Socinianism as opponents of the orthodox trinitarian position.