The image above is the bottom left panel in Jan van Eyck's famed Ghent Altarpiece. It was not painted by Jan van Eyck, but by early 20th century Belgian art copyist Jef Vanderveken. The original panel was stolen from the Cathedral of St. Bavo on the night of 10 April 1934, and never recovered.
A good article on the theft and the various attempts to solve the case.
