The figures in the lunettes refer to prophecies of the coming of Christ. The far left lunette shows the prophet Zechariah and the far right one shows Micah. The two much taller inner shutters show the Erythraean Sibyl (on the left) and the Cumaean Sibyl on the right. Each panel includes a text inscribed on a floating ribbon or "banderole", while the identities of the figures are carved on the lower border of each panel. Zechariah's text, taken from Zechariah 9:9, reads ("Rejoice greatly, O daughter of Zion ... behold, your king comes"), while the Erythraean Sibyl's words are ("Sounding nothing mortal you are inspired by power from on high"). To the right the Cumaean Sibyl's reads ("The Highest King shall come and shall be in the flesh through the ages").