Louis the Pious: Did you mean...?

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).

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

Louis-Antoine de Saint-Just (1767-1794), a leader of the Jacobin Club and of the Mountain political faction, oil on canvas portrait by Pierre-Paul Prud'hon, 1793. Only 25 when he was elected to the National Convention, Saint-Just soon became...

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).

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

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

Louis XIII of France (1601-1643), oil on canvas portrait by Philippe de Champaigne, 1635. Museo del Prado, Madrid.

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

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

Created in Tours, France, sometime between 1245-1248 CE, this stained glass panel depicts King Louis IX (r. 1226-1270 CE) carrying the crown of thorns. Measures 55 x 35 cm. (Metropolitan Museum of Art, New York)