A sleeping emperor receives a divine sign — in this haunting black-and-white photographic postcard, Piero della Francesca's luminous Renaissance fresco La Visione di Costantino (c. 1452–66) glows even through monochrome reproduction. Constantine lies propped on pillows inside his military tent, guarded by armored soldiers while a seated attendant keeps vigil; an angel swoops from the upper left bearing the cross-shaped light that would change Western history. The fresco, part of the celebrated Legend of the True Cross cycle in the Basilica di San Francesco in Arezzo, Tuscany, is considered one of the earliest masterworks of nocturnal painting in Western art — Piero rendered artificial light nearly two centuries before Caravaggio made it fashionable. The postcard itself is an early-20th-century real-photo style reproduction card, unused, with a clean undivided-style blank reverse, suggesting pre-1910 or early divided-back era Italian production. The caption reads in Italian: Arezzo – Chiesa di S. Francesco / La visione di Costantino (Piero della Francesca), making this a desirable souvenir art card for collectors of Italian Grand Tour ephemera and Renaissance iconography.