A drawing of an almost-naked man sitting upon a jumble of objects including armour, as he points towards a well-dressed woman sitting opposite him, with an infant held in her lap. Between them an old man stands leaning on the base of a sarcophagus with a globe at his feet. To the left are symbols of worldly activity – a globe and charts, musical instruments, a hunting dog with a dead hare. In a related painting the men are identifiable as Mars, god of war, reclining on a breastplate, and Time, leaning against a tomb. Both drawing and painting probably mark the birth in 1652 of the son of Carlo II Gonzaga, Duke of Mantua, who had reportedly befriended Castiglione in Rome a few years earlier. An allegory on the limits of temporal power would have been understood as central to a prince’s education. This drawing is related to the painting formerly in the Pellicioli Collection which bears the traditional title Marte e la Duchessa di Mantova col figlio sotto le spoglie di Giunone. There are two further related drawings in the Royal Collection; RCIN 904013, and RCIN 903860.