The Feast of Ss. Cosmas and Damian
On September 27th, we traditionally celebrate the feast of Ss. Cosmas and Damian, two brothers martyred in the persecution of Diocletian around 304 A.D. Despite the unreliable historical accounts of their lives, they are remembered as doctors who treated patients for free, and are therefore honored by the Eastern churches as “moneyless” saints. They moved from Arabia to Aegea in Cilicia, modern-day southeastern Turkey, where their Christian charity drew the attention of the Roman governor. Eventually, they were killed alongside their three brothers, Anthimus, Leontius, and Euprepius.
The Christianization of Rome and the Basilica's Historical Significance
Pope St. Felix IV constructed the basilica of Ss. Cosmas and Damian in 527 A.D., marking an important moment in the Christianization of Rome. This basilica represents two critical firsts in the Eternal City’s history. It was the first church built inside the Roman Forum, and one of the first “sanctuarium” in Rome, i.e. a church dedicated to saints who had no material connection to the site.
Constantine’s Churches and Expansion of Christianity
After the Emperor Constantine legalized Christianity in 313 A.D., he began constructing churches in several cities, including six in Rome. Initially, most of these churches were located outside the city walls, with the religion barely establishing a foothold in the ancient pagan city. Over the next two centuries, churches such as St. Anastasia, St. Clement, and Mary Major were built closer to the Forum, inching towards the heart of ancient Rome’s public and religious life.
The Iconic Mosaic of Ss. Cosmas and Damian
Below is the apsidal mosaic inside the church of Ss. Cosmas and Damian. On the far left, Pope Felix IV offers the church which he has built to Christ and His Saints. St. Paul presents one of the brothers to Christ, while St. Peter presents the other. Dressed as Roman senators, Peter and Paul, the patron Saints of Rome, stand closer to Christ. Meanwhile, Cosmas and Damian are depicted in foreign attire, with darker faces, reflecting how they would have appeared to a sixth-century Roman.

The Church's Placement within the Forum
The church of Ss. Cosmas and Damian was built utilizing two older structures: a hall from Emperor Vespasian’s Forum of Peace and a library built by Maxentius in the early 4th century. The entrance, located on the Via Sacra, symbolically places the Christian church at the heart of what was once the domain of pagan temples and Roman religious life.

Significance of the Gospel Read in the Basilica
During Lent, the Roman Rite traditionally reads from the Gospel of Luke at this church (4, 38-44), the accounting of Christ’s healing of St. Peter’s mother-in-law, and the expulsion of demons. When heard in this first Christian church of the Forum, the words “to other cities also I must preach the kingdom of God” remind worshippers of the Roman Empire’s role in spreading the Gospel.
Christianity’s Victory
The Basilica’s Legacy and Global Evangelization
The basilica of Ss. Cosmas and Damian stands as the first church in the Roman forum, the heart of the once-pagan city’s religious life. This choice symbolizes the Church’s mission to evangelize beyond the borders of the Roman Empire, extending to the native lands of Ss. Cosmas and Damian. It reflects the Church’s acceptance of its global duty to spread the Gospel.
The basilica of Ss. Cosmas and Damian remains a monument to both the early Christian church’s courage in the face of persecution and its victory over ancient Roman paganism. As the first Christian church built within the Forum, it holds a unique place in the history of the Christianization of Rome.









