Borromini born as Francesco Castelli in Swiss in 1599, went to Milan to study and work. In 1619 he moved to Rome where met his contemporaries Bernini and Maderno working at St.Peter’s Basilica and Palazzo Barberini. His first main work was the Church of San Carlo alle Quattro Fontane (1638-1641) on the Quirinale Hill. Another important work of Borromini was the Church of Sant’Agnese in Agone began in 1652 under the architects Girolamo Rainaldi and his son Carlo Rainaldi. After numerous quarrels, the other main architect involved was Francesco Borromini. Borromini and Bernini became rivals and Borromini and Bernini became rivals . Bernini’s Fountain of the Four Rivers is situated in front of the church. It is often said that Bernini sculpted the figure of the “Nile” covering his eyes as if he thought the facade designed by his rival Borromini could crumble atop him.