Louis the Pious: Did you mean...?

Battle of Poltava 1709, oil on canvas by Louis Caravaque. A painting depicting the decisive Russian victory at Poltava in 1709.

Restored studio portrait of Louis Pasteur (1822-1895), photographed by Paul Nadar.

A 1767 oil on canvas portrait by Louis-Michel van Loo of the French author and philosopher Diderot (1713-1784). (Louvre Museum, Paris)

Louis XIII Crowned by Victory, oil on canvas by Philippe de Champaigne, 1635. Louvre, Paris.

A 19th century CE illustration by Gustav Doré showing the French king Louis IX (r. 1226-1270 CE) and his capture by the army of the Ayyubid Empire during the Seventh Crusade (1248-1254 CE).

Bust of Louis Antoine de Saint-Just by French sculptor David d'Angers, 1848. David d'Angers Gallery, Angers, France. Photo credits to Wikipedia user Selbymay, 2011.

A 14th century CE illustration of Louis IX of France (r. 1226-1270 CE) departing Aigues Mortes for Egypt on the Seventh Crusade (1248-1254 CE).

Portrait of Louis Philippe II, Duke of Orléans (1747-1793) with the insignia of the Grand Orient of France. Oil on canvas portrait by Michel Garnier, 1781. Condé Museum, Chantilly.

Portrait of Louis Philippe II d'Orléans, as the Duke of Chartres. Oil on canvas, after Joshua Reynolds, c. 1779. Musée Condé, Chantilly.

The compound monocular microscope of Louis Pasteur (1822-1895). Made by Nachet et fils, 1861-70. (Science Museum, London)