Study for the Sforza Monument, c1488-1493 (1954). Study for the great bronze equestrian statue of Francesco Sforza, Duke of Milan, commissioned by his son and successor, Ludovico. Leonardo created a life-sized clay model of the statue, but it was never completed as in 1494 Ludovico used the 70 tons of bronze set aside for it to manufacture cannon to fight the invading French. Found in the collection of the Royal Library, Windsor Castle, Windsor. A print from Leonardo da Vinci by Ludwig H Heydenreich. (London, 1954).