The Teatro di San Carlo is a famous opera house in Naples, Italy. It is sometimes called the Teatro San Carlo or simply the San Carlo. Its name means Theatre of Saint Charles. It was built in 1737. When it was first built it was the biggest opera house in the world. Today, it is still one of the biggest opera houses in Italy. It is also the oldest opera house in Italy. Many operas were first performed at the Teatro di San Carlo. Seventeen of Donizetti's operas and eight of Rossini's operas were first performed there.