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Francesco Borromini, original name Francesco Castelli (born September 25, 1599, Bissone, Duchy of Lombardy [Italy]—died August 2, 1667, Rome), Italian architect who was a chief formulator of Baroque architectural style. Borromini (he changed his name from Castelli about 1627) secured a reputation throughout Europe with his striking design for a small church, San Carlo alle Quattro Fontane in Rome. He differed from Gian Lorenzo Bernini and other contemporaries in basing his designs on geometric figures (modules) rather than on the proportions of the human body.