The icon of Sancta Sanctorum called Acheropìta
The acheropite panel (not made by human hand) of the Redeemer in the Chapel of the Sancta Sanctorum at the Lateran, which is said to have been brought to Rome from the Orient, is a life-sized image of the Saviour. With the exception of its face, Innocent III had the whole figure covered in silver. Between the ninth and sixteenth centuries, on the day before 15 August, the Feast of the Assumption of the Virgin Mary, the icon was carried in procession to St Mary Major to “meet” the Salus Populi Romani, in what was a representation of Christ meeting his Mother at his death.
Vera effigies ss.mi Salvatoris ad Sancta Sanctorum de Urbe, in: Giovanni Marangoni, Istoria dell’antichissimo oratorio, o cappella di San Lorenzo nel Patriarchio Lateranense comunemente appellato Sancta Sanctorum e della celebre immagine del SS. Salvatore detta Acheropita, che ivi conservasi; colle notizie del culto e varj riti praticati anticamente verso la medesima..., Roma 1747