Lelio Sozzini, Italian Protestant theologian (born 1525)

Lelio Francesco Maria Sozzini, often known in English by his Latinized name Laelius Socinus, was an Italian Renaissance humanist and theologian, and, alongside his nephew Fausto Sozzini, founder of the Nontrinitarian Christian belief system known as Socinianism. His doctrine 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.