Portrait of Jakub Ludwik Sobieski.

This 1690 portrait of Jakub Ludwik Sobieski — son of the celebrated Polish King Jan III Sobieski — shows Henri Gascar working in a continental aristocratic context. Jakub was a significant political figure in late 17th-century Poland, considered as a candidate for several European thrones. Gascar had previously worked at the Polish court, and this portrait reflects the diplomatic and artistic networks connecting the French painting tradition to the Polish-Lithuanian Commonwealth.

The prince is shown in formal armor or court dress appropriate to his military and noble rank. Gascar renders the costume with careful attention to metallic surfaces and textile richness. The pose is formally erect, conveying the gravity expected of a royal prince.