The Papal Basilica of San Paolo Fuori le Mura (St. Paul outside the Walls), is one of Rome's four ancient, Papal, major basilicas: the Basilicas of St. John in the Lateran, St. Peter's, St. Mary Major, and St. Paul outside the Walls.

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At the beginning of the 4th century, with the end of the persecutions and the promulgation of the Edicts of Tolerance in favour of Christianity, Emperor Constantine ordered the excavation of the cella memoriae, the place where Christians venerated the memory of Saint Paul the Apostle, beheaded under Nero around 65-67 A.D. Above his grave, located along the Ostiense Way, about two kilometers outside the Aurelian Walls surrounding Rome, Constantine built a Basilica which was consecrated by Pope Sylvester in 324.  

Between 384 and 395 the Basilica, under the emperors Theodosius, Valentinian II and Arcadius, was restored and enlarged according to an extensive project consisting of five naves opening out into an atrium (quadriportico), or courtyard with four rows of columns. Throughout the centuries the Basilica would not cease to be embellished and enhanced by the Popes. For example, the massive defensive wall was built to protect against invasions at the end of the ninth century, while the bell tower and the magnificent Byzantine door were constructed in the eleventh century. Other important additions include Pietro Cavallini’s mosaics in the façade, the beautiful Vassalletto family’s cloister, Arnolfo di Cambio’s celebrated Gothic baldachin and the Candelabrum for the Paschal candle attributed to Nicola d’Angelo and Pietro Vassalletto of the thirteenth century. This historical period represents the golden age of what had been the biggest Basilica of Rome, until the consecration of the new Basilica of St. Peter in 1626. This sacred place of Christian pilgrimage was well-known for its artistic works.