Painted by the Van Eyck brothers, ‘The Adoration of the Mystical Lamb’ or ‘The Ghent Altarpiece’ is regarded as one of the greatest masterpieces of the Flemish Primitives. Installed in St Bavon’s Cathedral in Ghent as early as 1432, it escaped theft and looting on several occasions, However, on the night of 10–11 April 1934, two panels were stolen, one of which – ‘The Just Judges’ – has never been recovered to this day, because the bishop refused to pay the ransom demanded…