Date: 1111 ca.

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• The marble frontal was originally used to touch objects to the relics of the Quattro Coronati and five sculptors of Pannonia. The Marian image now covers the opening

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• The left inscription recalls Pope Leo IV's (847-855) transfer of the relics of the Quattro Coronati and the five sculptors of Pannonia from the Via Labicana

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• The right inscription recalls Pope Paschal II's (1099-1118) verification of the relics in the crypt. He rebuilt the church around 1111