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The reliefs on the upper and lower blocks of the left-hand jamb show similarities to the Annunciation group in Museo dell'Opera del Duomo, on this basis the group is attributed to Giovanni d'Ambrogio. Although these statues have also been attributed to such early Renaissance sculptors as Nanni di Banco and Jacopo della Quercia because of the resemblance of the heads to antique sculpture, the conception of the figures is Gothic, stylistically related to the angels on the lower block of the left-hand jamb of the Porta della Mandorla.
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