A cut-away wall reveals a small bedroom where an angel appears to Pope Sergius I in his sleep. The angel tells Sergius that the bishop Saint Lambert has been assassinated and Sergius is to appoint a new bishop, Saint Hubert. The angel holds a bishop's miter and crozier formerly belonging to Saint Lambert. To the right, the Pope and two cardinals go out into a brick enclosure, meeting a lawyer or noble and a Franciscan friar, who both kneel before the papal retinue and present petitions requesting benefits or indulgences.
