“The giant, fierce figure of The Colossus as he rises above a fleeing crowd of people, carts and animals is one of Spanish artist Francisco de Goya’s most dramatic and famous pictures – at least it was until yesterday, when Madrid’s Prado museum declared he had not painted it. … Experts at the museum now believe The Colossus was painted by one of Goya’s assistants, whose initials may appear in a corner of the canvass.”