Colart de Laon (active 1377/1411-1417) The Agony in the Garden with the Donor Louis d'Orléans tempera on panel 47 x 33.5 cm. (18.5 x 13.1 in.) Painted between 1405 and 1408 Collection of Prado Museum, Spain A secret lifted at the Prado Museum: An obscure painting, after restoration in Spain, turns out to be a ...