San Marco in Rome, June 2012

San Marco is a basilica in Rome dedicated to St. Mark located in the small Piazza di San Marco adjoining Piazza Venezia. It was built in 336 by Pope Mark and rebuilt in 833 by Pope Gregory IV.

336, Pope Mark built a church devoted to one of the Evangelists, his name bearer St. Mark, in a place called ad Pallacinas. The church is thus recorded as Titulus Marci in the 499 synod of Pope Symmachus. [At that time it became one of the stational churches of the city (Monday of the third week in Lent)].

After a restoration in 792 by Pope Adrian I, the church was rebuilt by Pope Gregory IV in 833.

Besides the addition of a Romanesque belltower in 1154, the major change in the architecture of the church was ordered by Pope Paul II in 1465-70, when the inside and the outside of the church were restyled according to the Renaissance taste. On that occasion the church was assigned to the Venetian people living in Rome, Paul II being a Venetian of birth.

The last major reworking of the basilica was started in 1654-57 and completed by Cardinal Angelo Maria Quirini in 1735-50. With these restorations, the church received its current Baroque decoration.

Text from: en.wikipedia.org/wiki/San_Marco,_Rome