The small Chapel of St. Zeno, off the right aisle of The Church, was built as a mausoleum for Paschal's mother Theodora. It is the only chapel in Rome entirely lined with mosaics. It is an extraordinary sight.

Inside, the Chapel of St. Zeno is cross-shaped and based on the plan of early pagan and Christian mausoleums. It also resembles a cubiculum (small room) in the catacombs.

The ceiling of the Chapel (pictured) depicts a mosaic bust of Christ with four angels.

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