The Church of St. Peter was officially consecrated in 1198. The part in white and black bands dating from the 13th century (probably made between 1256 and 1277), and was restored between 1931 and 1935. This part was derived from an older body, which consists of the early church, but left the bell tower is based on the chapel left of the presbytery.
The original church dates from the 5th century, in Syriac type, with rectangular plan and semicircular apse. It lost the title of parish in the late 14th century, in favor of the Church of San Lorenzo. It was officiated by the secular clergy until 1798.
References:The Cathedral of Saint Mary Major, often called Lisbon Cathedral or simply the Sé, is a Roman Catholic cathedral located in Lisbon, Portugal. The oldest church in the city, it is the seat of the Patriarchate of Lisbon. The cathedral has survived many earthquakes and has been modified, renovated and restored several times. It is nowadays a mix of different architectural styles.
The site where it stands was the principal mosque of Lisbon when it was an Arab settlement. The construction of the cathedral started around 1150, three years after the city was conquered from the Moors during the Second Crusade. Shortly after the victory the English knight Gilbert of Hastings was named bishop of the city of Lisbon.
One good reason to visit the Cathedral is to visit its charming cloisters located in the back. There are several tombs in the cathedral, the most notable of which is the beautifully sculpted tomb of Lopo Fernandes Pacheco and his wife.