The Ópera do Tejo (, Tagus Opera) or Real Casa da Ópera (Royal Opera House) was a luxurious opera house in Lisbon, Portugal. It was inaugurated on March 31, 1755, and destroyed by the 1755 Lisbon earthquake on November 1 of the same year. The theater was located in the historic center of Lisbon, next to the Tagus river in the area, attached to the old Ribeira Palace. The project was commissioned by José I of Portugal for the Italian architect Giovanni Carlo Galli da Bibbiena. The hall had capacity for 600 people on the floor and in 38 boxes. The theater was opened with the opera Alessandro nell'Indie by Davide Perez, with libretto by Pietro Metastasio. Before its destruction, the opera also premiered two operas by Antonio Mazzoni with libretti also by Pietro Metastasio, (June 6) and (October 16). See also List of theatres and auditoriums in Lisbon Notes External links Ópera do Tejo virtual site Opera houses in Portugal Music venues completed in 1755 Theatres completed in 1755 Buildings and structures demolished in 1755 1755 disestablishments in Portugal Former buildings and structures in Portugal Theatres in Lisbon