Career
His portrait was painted by Henri Matisse in 1918. Obtaining an illuminated copy of the Persian Shahnameh ("Book of Kings"), he broke it up into sheets to maximize profits by selling the illustrations individually. In 1923 he sued his former New York agent, Jean Vigoroux, in the French courts for embezzlement, while simultaneously suing Sir Joseph Duveen for slander in the American courts, for having declared a medieval statuette that Demotte had sold a fake.
Wegener was cleared of homicide by the French courts, but ordered to pay compensation to Demotte"s family.
His galleries, estimated at the time of his death to be worth $2,000,000, passed to his seventeen-year-old son Lucien Demotte (died 1934).