Teatro del popolo Trianon Viviani, Theatre in Forcella district, Naples, Italy

The Teatro Trianon Viviani is a 530-seat theatre in the Forcella area of Naples, on Piazza Vincenzo Calenda near Castel Capuano. It is built as a classic Italian-style house with three tiers of boxes. Renovation work between 2000 and 2002 exposed, in the stalls, the Greek remains of the Torre della Sirena, a 4th–3rd century BC tower, the only one still standing above ground in Campania.

The theatre was inaugurated on 8 November 1911 in the Forcella area; its owner was Amadio Salsi, and the opening show starred Vincenzo Scarpetta as don Felice Sciosciammocca in his father Eduardo Scarpetta's comedy Miseria e nobiltà. Bought in 1923 by Giuseppe De Simone and Gennaro De Falco, it passed in 1940 to Gustavo Cuccurullo, who in 1947 turned it into a cinema renamed Splendore. On 7 December 2002 a namesake great-nephew, Gustavo Cuccurullo, restored it as a theatre under the name Trianon, opening with Raffaele Viviani's Eden Teatro directed by Roberto De Simone. It became public in April 2006 and was dedicated to Viviani.

The theatre is dedicated to the Neapolitan song, and its name honours the playwright and actor Raffaele Viviani since it became a public theatre in 2006. In the 1950s and 1960s the hall hosted Piedigrotta song festivals, where singers such as Sergio Bruni, Mario Trevi and Pino Mauro performed. The programme still mixes the classic repertoire with contemporary Neapolitan music.

The theatre seats 530 in a classic Italian horseshoe layout over three tiers of boxes, and its air-conditioning allows year-round programming. In the stalls, look for the Greek remains of the Torre della Sirena (4th–3rd century BC), the only tower still standing above ground in Campania. Additional rooms host exhibitions, seminars and conferences.

The building preserves one of Naples' last remaining watchtowers, connected to the legend of the siren Parthenope, after whom the ancient city was named. This tower is a tangible piece of the city's ancient past woven into a modern cultural space.