San Marco

Map of the Churches of Rome
Church of San Marco, Rome
San Marco
San Marco Evangelista al Campidoglio, to give the church its full name, was originally built by Pope Mark (r. 336), making it the first place of public Christian worship in the heart of Rome. However, San Marco, which is the national church of Venice, has been subsequently restored and rebuilt on several occasions. The last major reworking was completed by Cardinal Angelo Maria Quirini between 1735 and 1750.
Portico, San Marco, Rome
Portico
The portico contains many interesting objects. Embedded into the right wall is the tomb slab of Vannozza Cattanei, mistress of Cardinal Borgia, later Pope Alexander VI (r. 1492-1503), to whom she bore four children, including the infamous Cesare and Lucrezia.  Near the tomb slab is an early medieval well-head carved from part of an ancient column. It sports a very crudely carved inscription, cursing anyone who sold water drawn from the well. 

Portico

st-mark-the-evangelist-by-isaia-da-pisa-church-of-san-marco-rome
St Mark the Evangelist
The sculpture of St Mark (and lion), above the entrance to the church, is attributed to Isaia da Pisa (active 1447-64). 

Nave

Nave, church of San Marco, Rome
Nave
The interior comprises a nave and two aisles. 
Apse, church of San Marco, Rome
Apse
The beautiful mosaics in the apse were added by Pope Gregory IV (r. 827-44). ​​
Nave ceiling, church of San Marco, Rome
Nave Ceiling
The nave ceiling (1465-68) bears the coat of arms of Pope Paul II (r. 1464-1471). 
Coat of arms of Pope Paul II (r. 1464-71), church of San Marco, Rome
Coat of arms of Pope Paul II
The work of Giovannino and Marco de' Dolci, it is one of only two 15th century wooden ceilings to survive in a Roman church. The other is at Santa Maria Maggiore. ​
18th century stucco relief, church of San Marco, Rome
Stucco relief
The large stucco reliefs (in the nave and sanctuary) depict the twelve apostles and were executed by a variety of artists in the 1740s.

Funerary Monuments

Funerary monument to Francesco Erizzo, church of San Marco, Rome
Funerary monument to Francesco Erizzo
The inscriptions reads: To Francesco Erizzo, an outstanding young man—distinguished by virtue, character, and excellence of both body and, even more so, mind—who was taken in the prime of youth; Niccolò Erizzo, Knight and Venetian Ambassador, erected this monument to his dearest and inconsolable son in the year 1700.
Funerary monument to Cardinal Cristoforo Vidman, church of San Marco, Rome
Funerary monument to Cardinal Cristoforo Vidman
The ​funerary monument to Cardinal Cristoforo Vidman († 1660) is the work of the Roman sculptor Cosimo Fancelli (1618-88). 
Funerary monument to Cardinal Luigi Prioli, church of San Marco, Rome
Funerary monument to Cardinal Luigi Prioli
The funerary monument to Cardinal Luigi Prioli († 1720) has allegorical statues of Justice and Charity.  
Funerary monument to Pietro Basadonna, San Marco, Rome
Funerary monument to Pietro Basadonna
The funerary monument to Cardinal Pietro Basadonna († 1684) is by Filippo Carcani, a pupil of Bernini. The statues symbolise Fortitude and Faith. 
The funerary monument of Leonardo Pesaro, son of the Venetian ambassador to the Holy See, was only 16 when he died on the Ides of March 1796. The monument is an early work of the great neoclassical sculptor Antonio Canova (1757-1822).