1300-1310, probably by Guillaume Julien (French), Cleveland, The Cleveland Museum of Art, The Mary Spedding Milliken Memorial Collection, gift of William Mathewson Milliken, 1932.537. Public domain.

A 13th-century fresco rediscovered in Ferrara, Italy, provides unique evidence of medieval churches using Islamic tents to conceal their high altars. The 700-year-old fresco is thought to be the only ...