 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.The Arcus Novus (an arch erected by emperor Diocletian in 303-304), which stood on this site were destroyed during reconstruction of the church in the late 15th century, c. 1491.