Attributed to Jan van Eyck

Only a handful of Jan van Eyck's panels carry his signature, some with his motto Als ich can, as well as I can. After his death in Bruges in 1441 his workshop and followers kept repeating his designs, and the line between his own brush and theirs has been argued over ever since.

Attributed to Jan van Eyck is the label a museum uses when it believes a work is his but cannot prove it. The best-known puzzle is a pair of small, almost identical panels of Saint Francis receiving the stigmata, one in the Galleria Sabauda in Turin and one in the Philadelphia Museum of Art. Neither is signed, and scholars still disagree over whether both, one or neither came from his hand. The earliest written trace is the will of the Bruges merchant Anselm Adornes, who in 1470 left two pictures of Saint Francis by van Eyck.