In the medieval churches of Rome and Lazio the visitor's eye tends to rise towards the apses, the mosaics, the ceilings. Yet one of the masterpieces of Italian sacred geometry lies underfoot: the inlaid floors of coloured marble made by Roman marble workers between the twelfth and thirteenth centuries, known as Cosmatesque pavements. Porphyry circles, interlaced bands, tiny stars and triangles make up a design that accompanies the walk from the entrance to the altar.
Who the Cosmati were
The name comes from Cosma, or Cosmatus, a name that recurs in one of the families of marble workers active in Rome at the time. By extension, «Cosmatesque» art refers to the work of several family workshops that handed the craft down from generation to generation. Some of these masters signed their works with inscriptions, alongside the title of magister.
These workshops made not only floors but also liturgical furnishings: pulpits, candlesticks for the Easter candle, choir screens, episcopal thrones, cloisters with decorated columns.
The reuse of ancient marble
A fundamental feature of Cosmatesque art is reuse. Medieval Rome was full of ancient ruins, and the marble workers found there precious materials that no one could quarry any longer: red porphyry from Egypt, green serpentine from Greece, giallo antico from North Africa and many others.
The large porphyry roundels seen at the centre of the floors are often slices of ancient columns, cut crosswise. The gesture also has a symbolic value: the stones of the ancient world are incorporated into a new order, in the service of Christian space.
The geometric motifs
Cosmatesque pavements combine a few fundamental motifs with endless variations:
| Motif | Description | Possible reading |
|---|---|---|
| Rota | large disc of porphyry or serpentine | centre, unity, place of pause |
| Quincunx | four smaller circles around a central one, linked by a band | the cosmos ordered around a centre |
| Guilloche | continuous band winding around a series of circles | path, continuity, bond |
| Panels | rectangular fields filled with small triangles, squares, hexagons | the ordered multiplicity of creation |
The quincunx is the most characteristic motif. The Latin name indicates an arrangement of five elements like the dots of a five on a die: four at the corners and one in the centre. In a symbolic reading, the four outer circles can recall the elements, the seasons, the cardinal points or the evangelists, while the central circle represents the unity that holds them together.
A floor to be walked
The design of Cosmatesque pavements is not evenly distributed. Along the central nave there often runs a sequence of large circles and quincunxes aligned on the building's axis, leading the eye and the steps towards the presbytery. The side aisles usually have simpler, repetitive motifs.
In this way the floor becomes a map of the liturgical route: whoever enters walks along a line of successive centres, from the outside world towards the altar. Some large porphyry roundels were stopping places during ceremonies. According to tradition, in old St Peter's a porphyry roundel marked the spot where rulers knelt during the imperial coronation.
Where to see them
Rome preserves numerous examples, including the floors of:
- San Clemente, with its clearly legible medieval layout;
- Santa Maria in Cosmedin, also known for the Bocca della Verità in its portico;
- Santa Maria in Trastevere;
- San Lorenzo fuori le Mura.
Floors of this kind are also found in several cathedrals and churches of Lazio. The case furthest from Rome is perhaps the most surprising: the Great Pavement of Westminster Abbey, in London, made in the thirteenth century by a Roman craftsman named Odoricus, with Cosmatesque materials and techniques. An inscription, now partly lost, recorded its maker and date.
The patience of detail
Looking closely at a Cosmatesque pavement one notices the extraordinary minuteness of the pieces: triangles a few centimetres across, combined to form stars, lozenges, chequerboards. Each piece was cut by hand and fitted to the others. The perfection of the whole arises from the sum of countless small gestures.
Maestro Cornelio invites us to look at these floors as a lesson in humility and order: sacred geometry dwells not only in domes and rose windows but also in the ground we tread, and every step can become part of a greater design.
In short
- Cosmatesque pavements were made by workshops of Roman marble workers between the twelfth and thirteenth centuries.
- They reused precious ancient marble, such as red porphyry and green serpentine, often cut from columns.
- The most typical motif is the quincunx: four circles around a central circle.
- The design guides the walk along the axis of the church, from the entrance to the presbytery.
- Examples are found in many churches in Rome and even in Westminster Abbey.
