Fontana delle Tartarughe first water flowing to a reservoir near the present Trevi Fountain. Della Porta and the city of Rome made a plan to build eighteen new fountains connected to the new aqueduct. He began in 1572 with the fountain in Piazza del Popolo, then built the two famous fountains of Piazza Navona (1574–1578), and the fountain in Piazza della Rotonda in front of the Pantheon (1575). + In the original plan of 1570 a new fountain was to have been placed near the Theater of Marcellus in the Piazza Giudea, the site of a market in the Roman Ghetto. One of
Sant'Agnese in Agone of this church is unrelated to the ‘agony’ of the martyr: "in agone" was the ancient name of Piazza Navona ("piazza in agone"), and meant instead, from the Greek, ‘in the site of the competitions’, because Piazza Navona was built on the form of an ancient Roman stadium on the Greek model, with one flat end, and was used for footraces. From ‘in agone’, the popular use and pronunciation changed the name into ‘Navona’, but other roads in the area kept the original name. Bernini's "Fountain of the Four Rivers" is situated in front of the church. It is often