Pope Leo X launched a design competition in 1518 for the national church of Florence in Rome, on the site of the old church of San Pantaleo. Entrants included Baldassare Peruzzi, Jacopo Sansovino, Antonio da Sangallo the Younger and Raphael. Sansovino won, but Sangallo and Giacomo della Porta carried out construction.
Main construction ran from 1583 to 1602 under della Porta, on a Latin cross plan. Carlo Maderno directed the dome and main body from 1602 to 1620. The facade follows a design by Alessandro Galilei and was not finished until 1734. The infobox gives groundbreaking as 1523.
The article calls the style Baroque. Francesco Borromini is buried under the dome. The article gives no dimensions, materials or visiting details.

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