 Complete the following phrase:  In 1912 he was officially commissioned to design the Hubert and Jan in Ghent, together with the architect Valentin Vaerwyck, who was in charge of the architectural part. The brothers Van Eyck were the medieval painters of the Ghent altarpiece Adoration of the Mystic Lamb .With great interest, the internationally ficed monument was inaugurated by King Albert on 9 August 1913 at the 