These panels, showing narrative scenes of Abner's Messenger before David (?) and The Queen of Sheba Bringing Gifts to Solomon, once formed the interior wings of a triptych. The Annunciation on the reverse sides would have been visible when the altarpiece was closed. Painted in grisaille in imitation of stone sculpture, the Annunciation acted as a prelude to the theme of Christ’s Incarnation represented in the Adoration of the Magi of the triptych’s central panel (Galleria Colonna, Rome).