Domenico Fetti was in Rome in 1606 when the Veil of Veronica, one of the oldest and most venerated relics in Christendom, was installed in the crossing of St. Peter's Basilica. According to medieval legend, the veil belonged to a woman who took pity on Christ as he toiled with his burden of the cross to Golgotha. She gave Christ her kerchief to wipe his brow, and when he returned the cloth, his image miraculously had been impressed upon it. This kerchief was believed to have been preserved as the relic called the "true image" or, in Latin, vera icon . In time, these words combined to form "Veronica," the name given by legend to the compassionate woman at Golgotha.
Fetti's depiction of the relic is compellingly realistic. Isolated against a dark background and draped over a bar, the fabric's texture, folds, and fringed border are rendered with painstaking care. Hovering on its surface is Christ's visage -- the flesh solidly modeled and tangible. Fetti's amazingly true image of the "true image" is, in a sense, a metaphor of the task of the painter. This is not merely a brilliant and self-conscious exhibition of the painter's skill, however, but a sensitive and deeply felt portrayal of Christ at the moment of his most intense physical and spiritual suffering.
More information on this painting can be found in the Gallery publication Italian Paintings of the Seventeenth and Eighteenth Centuries, which is available as a free PDF https://www.nga.gov/content/dam/ngaweb/research/publications/pdfs/italian-paintings-17th-and-18th-centuries.pdf