The sitter of this portrait, Giovanni Battista di Castaldo, was an illustrious Neapolitan soldier who fought in the service of Charles V and took part in important military actions such as the Battle of Pavia and the victory at Mühlberg. He is shown standing with his sword at his side and the cross of the Order of Santiago on his breast. The dignity of his character, looking out at the viewer with a lofty and distant expression, is reflected in his pose and deportment as well as in his plain but luxurious dress.
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