The painting also shows a young page and Charles' picture-buying agent and favoured courtier, Endymion Porter, who is holding the horse.
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Van Dyck painted one other major portrait of Charles I with a horse: Charles I at the Hunt (Le Roi à la chasse, c.1635, now in the Louvre), which depicts Charles standing next to a horse in civilian clothing, as if resting on a hunt, wearing a wide-brimmed Cavalier hat and leaning on a walking cane, gazing at a coastal scene; a picture of "gentlemanly nonchalance and regal assurance".