 The medallion is encircled with a sprawling floral ornament with flowers, birds and animals, this probably original from the 4th century.In the lower strip of the mosaic we can see the standing figures of St Peter, St Paul and Pope Nicholas IV (left side), and St John the Baptist, St James the Great, St Antony and Jacopo Colonna (right side).The walls are decorated with scenes from the life of Mary.