A 13th century icon of the Blessed Virgin is enshrined above the high altar. The Vallecellian Madonna and Child, frescoed on a hovel across the street, had been venerated throughout the Middle Ages. In 1535, after losing out in a hotly-contested street competition, a resentful ball-player hurled (or kicked) a stone at the revered image, which began to bleed from the cheek and neck. The canvas covering the icon is by Peter Paul Rubens.