Porta, Giacomo della (jäˈkōmō dĕlˈlä pôrˈtä) [key], c.1540–1602, Italian architect and sculptor. After working with Vignola and Michelangelo, he completed several important works designed or begun by them, above all the cupola of St. Peter's, as well as the Farnese Palace, and the facade of Il Gesù, Rome. His other works include the Villa Aldobrandini (damaged in World War II) in Frascati and some fountains in Rome.
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