Luigi Vanvitelli (1700 – 1773) was an Italian engineer and architect. Vanvitelli was born in Naples, the son of an Italian woman, Anna Lorenzani, and a Dutch painter of land and cityscpapes, Caspar van Wittel, who also used the name Vanvitelli. He was trained in Rome by the architect Nicola Salvi, with whom he worked on construction of the Trevi Fountain. Following his notable successes in the competitions for the facade of the Basilica di San Giovanni in Laterano (1732) and the facade of Palazzo Poli behind the Trevi Fountain, Pope Clement XII sent him to the Marche to build some papal projects. At Ancona in 1732, he devised the vast Lazaretto, a pentagonal building covering more than 20,000 square meters, built to protect the military defensive authorities from the risk of contagious diseases potentially reaching the town with the ships. Later it was used also as a military hospital or as barracks. In Rome, Vanvitelli stabilized the dome of St. Peter's Basilica when it developed cracks and found time to paint frescos in a chapel at Sant Cecilia in Trastevere. He also built a bridge over the Calore Irpino in Benevento. Beginning in 1742 Vanvitelli designed (along with Nicola Salvi) the Chapel of St. John the Baptist for King John V of Portugal. It was built in Rome, disassembled in 1747, and shipped to Lisbon, where it was reassembled in the Church of St. Roch (Igreja de São Roque). It was completed in 1750, although the mosaics in it were not finished until 1752.
Source: Wikipedia