 The church's upper level was added in the 9th century, and murals added to the lower level between the 7th and 9th centuries (these have been detached for conservation reasons).The cosmatesque pavement from this phase survives.The church's 13th century icon of the "Virgin Advocate", said to have performed many miracles, and relics of the 3rd century Deacon and martyr Agapitus lie beneath it.