This is a sketch of the fresco that Corrado Giaquinto painted in the former stairway at the Madrid’s Royal Palace, which is now the Hall of Columns. That fresco, his last work at the Royal Palace, is undoubtedly one of the finest paintings from Giaquinto’s Spanish period.He concluded it in 1762, so the sketch presented here must have been made slightly earlier. At the top is the figure of Apollo,