The Basilica of San Clemente is a complex archaeological site in Rome that features three distinct layers of history built one atop the other. The current 12th-century basilica stands at street level, constructed over a 4th-century church, which in turn was built upon a 1st-century Roman house and a 2nd-century Mithraeum.
The site provides a unique vertical cross-section of Roman history, illustrating the transition from pagan worship to early Christianity and the evolution of medieval ecclesiastical architecture. The subterranean levels are particularly noted for their well-preserved frescoes and the ancient Roman masonry that forms the foundation of the entire complex.
Key Facts
- Materials
- Travertine, Brick, Marble, Tufa
- Civilization
- Roman / Medieval
- Accessibility
- Ground floor accessible; lower levels require navigating stairs
- Date(s)
- 1st century CE - 12th century CE
- Condition
- Active basilica and archaeological museum
- Original Function
- Roman private residence and Mithraeum
- Key Figures
- Pope Clement I, Paschal II
Roman Origins
1st century CEThe lowest level consists of a large Roman house and a warehouse structure. By the 2nd century, a portion of this complex was converted into a Mithraeum, a sanctuary dedicated to the mystery cult of Mithras.
Early Christian Basilica
4th century CEFollowing the legalization of Christianity, the Roman house was repurposed into a titular church. This structure served as the primary place of worship until it was damaged during the Norman sack of Rome in 1084.
Medieval Reconstruction
12th centuryThe current upper basilica was commissioned by Pope Paschal II. It incorporated many architectural elements from the older church, including the marble choir screen and the floor mosaics.
Baroque Additions
17th-18th centuryThe interior of the upper basilica underwent significant Baroque modifications, including the addition of a new ceiling and various side chapels, while maintaining the medieval mosaic layout.