Socinianism
Socinianism (/soʊˈsɪniənɪzəm, səˈ-/ soh-SIN-ee-ə-niz-əm, sə-) is a Nontrinitarian Christian belief system developed and co-founded during the Protestant Reformation by the Italian Renaissance humanists and theologians Lelio Sozzini and Fausto Sozzini, uncle and nephew, respectively.
It was developed among the Polish Brethren in the Polish Reformed Church between the 16th and 17th centuries, and embraced by the Unitarian Church of Transylvania during the same period. Socinianism is most famous for its unitarian belief but contains a number of other distinctive theological doctrines, such as the denial of divine foreknowledge regarding the actions of free agents and rejection of the pre-existence of Christ.