(b Rome, 18 March 1602; d Viggiù, 15 Dec 1660). Son of (2) Onorio Longhi. He was active mainly in Rome. He trained as an architect with his father, from whom he inherited an eccentric and contentious personality. As an architect he was the most daringly original of his family and was at his most innovative when designing church façades. His architectural work was never doctrinaire, and he was consistently guided by progressive principles. While he never received a significant papal commission, as did his contemporaries Gianlorenzo Bernini, Pietro da Cortona and Carlo Rainaldi, he introduced a number of innovations into the repertory of Roman Baroque architecture, such as the rich treatment of diagonal elements on façades.
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