The space currently occupied by the Piazza Navona was originally the Stadium of Domitian, built by Emperor Titus Flavius Domitianus in 80 AD.

Defined as a public space in the last years of 15th century, when the city market was transferred there from the Campidoglio, Piazza Navona was transformed into a highly significant example of Baroque Roman architecture and art during the pontificate of Innocent X, who reigned from 1644 until 1655, and whose family palace, the Palazzo Pamphili, faced the piazza.

It features important sculptural creations: in the centre stands the famous Fontana dei Quattro Fiumi or Fountain of the Four Rivers (1651) by Gian Lorenzo Bernini, topped by the Obelisk of Domitian, brought in pieces from the Circus of Maxentius;[2] the church of Sant'Agnese in Agone by Francesco Borromini, Girolamo Rainaldi, Carlo Rainaldi and others; and the aforementioned Pamphili palace, also by Girolamo Rainaldi, that accommodates the long gallery designed by Borromini and frescoed by Pietro da Cortona.

At the southern end is the Fontana del Moro with a basin and four Tritons sculpted by Giacomo della Porta (1575) to which, in 1673, Bernini added a statue of a Moor, wrestling with a dolphin.

Police later found the man, who had been captured on security cameras climbing in the fountain, wielding a large rock and decapitating some of the larger and smaller figures, after they recognised him by his shoes.