Giovanni Vasanzio is the italianized name of Jan Van Santen, a Flemish architect who came to Rome from Holand around 1600. He was a collaborator of architect Flaminio Ponzio, several works in Rome were done by him. After the death of his teacher, in 1613, he was the one who completed the most important reconstruction of S. Sebastiano Fuori le Mura. In the same year he was designated as the pope's official architect, owing to the intervention of Scipione Borghese and he built the Borghese country house, in the grounds of Villa Borghese, seat of the art Gallery by the same name, the Gardens and the Theatre of Palazzo Pallavicini. Many were his works also in Rome's surrounding areas, such as in Frascati ( Villa Mondragone, 1613) and in Artena. His is the fountain of Ponte Sisto, designed and built with g. Fontana; fed by the Acqua Paola, it was commissioned by Paolo V (1605 – 1621) and it was called the fountain of the “hundred priests” because it was next to the Beggar's Lodge by the same name, whose construction was ordered by Sisto V (1585-1590) between Via Giulia and Ponte Sisto. When, in 1879, the Lungotevere was built and the Lodge was demolished, the fountain was removed and, in 1898, reassembled on the Tiber's opposite shore, in Piazza Trilussa, where it stands to this day.