The Calimala's acquiescence is traditionally explained by Cossa's donation of the relic of the right index finger of John the Baptist (and 200 florins for an appropriate reliquary) to the Baptistry. With this finger John was believed to have pointed to Jesus, saying "Ecce Agnus Dei" ("Behold the lamb of God") in . The long and complicated history of the relic would only have increased the legendary status of the finger: Philotheus Kokkinos, Patriarch of Constantinople presented it in 1363 to Pope Urban V, who passed it to his successors Gregory XI and Urban VI, who was dispossessed of it during the siege of Nocera, after which John XXIII bought it for 800 florins and wore it on his person before hiding it in the monastery of Santa Maria degli Angeli.