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.
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