Giovanni Pico della Mirandola was an Italian Renaissance nobleman and philosopher. He is famed for the events of 1486, when, at the age of 23, he proposed to defend 900 theses on religion, philosophy, natural philosophy, and magic against all comers, for which he wrote the Oration on the Dignity of Man, which has been called the "Manifesto of the Renaissance", and a key text of Renaissance humanism and of what has been called the "Hermetic Reformation". He was the founder of the tradition of Christian Kabbalah, a key tenet of early modern Western esotericism. The 900 Theses was the first printed book to be universally banned by the Church. Pico is sometimes seen as a proto-Protestant, because his 900 theses anticipated many Protestant views.
Giovanni Pietro Maffei (1533–1603), also anglicized as John Peter Maffei, was an Italian Jesuit and author. He wrote a life of Ignatius of Loyola, founder of the Society of Jesus, and also wrote about the activities of the Society in the Orient.
Giovanni Pontano (1426–1503), later known as Giovanni Gioviano, was a humanist and poet from Cerreto di Spoleto, in central Italy. He was the leading figure of the Accademia Pontaniana after the death of Antonio Beccadelli in 1471, and the academy took his name.
Giovanni Ruffini was an Italian writer and patriot of the early 19th century. He is chiefly known for having written the draft of the libretto of the opera Don Pasquale for its composer Gaetano Donizetti.