The Cathedral of Saint Mary Major, often called Lisbon Cathedral or simply the Sé, is a Roman Catholic cathedral located in Lisbon, Portugal. It is the oldest church in the city, built in 1147. The cathedral has survived many earthquakes and has been modified, renovated and restored several times, resulting in a mix of different architectural styles. It is the seat of the Patriarchate of Lisbon, and has been classified as a National Monument since 1910.