Piazza Navona is a public open space in Rome, Italy. It is built on the site of the 1st century AD Stadium of Domitian and follows the form of the open space of the stadium in an elongated oval. The ancient Romans went there to watch the agones ("games"), and hence it was known as "Circus Agonalis". It is believed that over time the name changed to in avone to navone and eventually to navona.

Sant'Agnese in Agone is a 17th-century Baroque church in Rome, Italy. It faces onto the Piazza Navona, one of the main urban spaces in the historic centre of the city and the site where the Early Christian Saint Agnes was martyred in the ancient Stadium of Domitian. Construction began in 1652 under the architects Girolamo Rainaldi and his son Carlo Rainaldi. After numerous quarrels, the other main architect involved was Francesco Borromini.