In the picture, the execution is taking place upon a raised wooden platform similar to those on which executions of royalty and nobility had taken place in the French Revolution. The edge of this platform can be seen, draped with a black cloth, across the foreground of the picture. At the rear of the pictorial space the handrail of stairs descends, and the tops of two weapons indicate the presence of guards. Delaroche was presumably aware that the Tower of London was founded by William of Normandy. In the painting, two stout Norman columns with cushion capitals, a blind arcade, and a large chevroned arch create a backdrop indicative of the antiquity of the site. However, the buildings within the Tower of London span the reigns of many monarchs. In fact, the execution took place outside the Chapel of St Peter ad Vincula, which was constructed not at the time of William the Conqueror but by order of Henry VIII, and therefore in a style postdating that of the architecture in the painting by nearly 500 years.