Eustachy Erazm Sanguszko w mundurze kawalerii narodowej

Eustachy Erazm Sanguszko (1768–1844) was a Polish-Lithuanian magnate who served in the national cavalry during the Kościuszko Uprising of 1794, when he would have worn the national cavalry uniform depicted here. The Sanguszko family were one of the great noble houses of the Polish-Lithuanian Commonwealth, with extensive estates in Volhynia, and the family's Sławuta stud was among the most famous horse-breeding operations in the region. Kossak painted this equestrian portrait in 1871, nearly three decades after Sanguszko's death, making it a commemorative work based on visual records rather than a sitting. The Tarnów District Museum, which holds the canvas, is in Galicia — the Austrian partition zone — where Polish noble memory was more freely preserved than in Russian or Prussian Poland. The choice of the national cavalry uniform of 1794 aligned the magnate explicitly with the tradition of armed resistance.

The equestrian portrait format gives Kossak scope to render both the distinguished sitter and his horse with equal care. The national cavalry uniform is documented with historical accuracy: the specific cut, insignia, and headgear that identify the wearer as a participant in the Kościuszko Uprising. The horse's breed characteristics — associated with the Sanguszko stud — are rendered with attention to the specific equine type.