A formal portrait of the British statesman William Windham III, painted by John Jackson after Sir Thomas Lawrence.

This portrait depicts William Windham III, a prominent British politician and statesman who served as Secretary at War. John Jackson, a skilled portraitist of the early nineteenth century, executed this work after an original composition by Sir Thomas Lawrence. The painting captures Windham in a formal, contemplative pose, leaning against a surface draped in deep red fabric. He holds a document in his left hand, a common iconographic device in portraiture of the period to denote the subject's professional duties and intellectual engagement.

Jackson employs a controlled palette, dominated by the dark tones of Windham's coat and the dramatic, atmospheric red of the background. This contrast draws the viewer's attention to the sitter's face, which is rendered with careful attention to the nuances of light and shadow. The brushwork is precise, reflecting the academic training that defined the era's approach to portraiture. The composition follows the conventions of the grand manner, presenting the subject with a sense of gravity and public stature.

William Windham was a significant figure in the political life of the late eighteenth and early nineteenth centuries, known for his oratorical skills and his involvement in the debates surrounding the French Revolution. This portrait serves as a visual record of his public persona, stripped of excessive ornamentation to focus on the character of the man. Jackson's ability to translate the style of Lawrence into his own hand demonstrates his technical proficiency and his role within the British portrait tradition. The work remains a fine example of the period's focus on individual identity and political authority, presented through the medium of oil on canvas.