Basilica of St Mark (Rome)

 basilica, Roman Catholic church

San Marco' is a basilica dedicated to St Mark the Evangelist, patron saint of the Venetian republic. The basilica was probably founded by Pope St Marcus (Mark) in 336, and is one of Rome's oldest churches. It stand on the site where St Marcus is said to have lived, and was known as the Titulus Pallacinae. It has a Romanesque campanile

The church was rebuilt in the 5th century, and was left facing the opposite direction.

It was reconstructed in the 8th century by Pope Adrian I (772-795), and given back its original orientation, which it has today. It was flooded when the Tiber rose above its banks soon after, in 791. Pope Gregory IV (827-844) restored it after the flood.
The bell-tower was added in 1100.
Pietro Cardinal Barbo, titular of the church and later Pope Paul II, restored it again in 1455-1471. At the same time, he built the Palazzo Venezia. Cardinal Barbo declared San Marco as the national church of the Venetians.
he full name of the church is San Marco Evangelista in Campidoglio, St Mark the Evangelist at the Capitol.