Celso Sozzini (1517–1570) was an Italian freethinker, brother of Alessandro (father of Fausto), Lelio, Cornelio, Dario, and Camillo.[1] [2]
Celso's father Mariano Sozzini il giovane (1482–1556) had eleven sons and two daughters. Alessandro, father of Fausto Sozzini, was the eldest but died young.
Celso first taught in Siena,[3] and was founder of the short-lived Accademia del Sizienti (1554) of Bologna,[4] of which young Fausto was a member.