This artist's designs include the trompe-l'oeil colonnade linking the courtyards of the Palazzo Spada and the Falconieri chapel, which was finished by his assistant Massari after this man's nervous condition led him to commit suicide. This apprentice of Carlo Maderno replaced Carlo Rainaldi on the project of enlarging St. Agnes in Agone, patronized by Innocent X. The son of the stone cutter Giovanni Castelli, he's probably best known for his work on Sant'Ivo and his first independent commission,
This artist's designs include the trompe-l'oeil colonnade linking the courtyards of the Palazzo Spada and the Falconieri chapel, which was finished by his assistant Massari after this man's nervous condition led him to commit suicide. This apprentice of Carlo Maderno replaced Carlo Rainaldi on the project of enlarging St. Agnes in Agone, patronized by Innocent X. The son of the stone cutter Giovanni Castelli, he's probably best known for his work on Sant'Ivo and his first independent commission, ►San Carlo alle Quattro Fontane. FTP, name this Baroque architect not to be confused with Brunelleschi, Bramante, or his archrival Bernini. 
This artist's designs include the trompe-l'oeil colonnade linking the courtyards of the Palazzo Spada and the Falconieri chapel, which was finished by his assistant Massari after this man's nervous condition led him to commit suicide.
Francesco Borromini (or Francesco Castelli before Castelli is mentioned)