In 2014, a project based at the Study Centre for the Flemish Primitives at the Royal Institute for Cultural Heritage, Brussels (KIK-IRPA), began a study of paintings by Jan van Eyck (c. 1390-1441) in European Collections. In September 2015, the project came to Madrid to document Van Eyck’s Diptych of the Annunciation, painted in the mid-late 1430s.