Three paintings, in tempera on a gold background, depicting two Doctors of the Church and the Blessing Christ, works of 1404 by Mariotto. They formerly held back the curtains of the wooden canopies over the altars dedicated to the Holy Trinity, which once stood along the counter-façade of the Cathedral before their removal in the 19th century. The composition was completed by two other Doctors of the Church, gone in the meantime lost. On the altar was placed the so-called "Altarpiece of the Intercessions" referred by scholars to the context of Lorenzo Monaco. Between 1409 and 1414 the group of the Annunciation intended for the Porta della Mandorla was also placed on the altar (attributed to Giovanni d'Ambrogio and now in the Museum). In occasion of the demolition of the altar, the paintings were preserved in the Sacristy of the Canons and later exhibited in the Museum while the altarpiece returned to the Pecori family and then passed into the collection of the Metropolitan Museum in New York.