Florence, Museum of the Opera del Duomo (Museum of Florence Cathedral of Santa Maria del Fiore): “the silver altar of St. John's Treasure” (1367 - 1483), by florentine masters.Right corner pillar: enamelled plate within a spire window with the figure of a sibyl holding the motto “(mitto angelum meum ANTE FACIEM TUAM QUI PRAEPARABIT VIAM TUAM”.
