The Duke of Penthièvre was a title in the French nobility, held by members of the House of Bourbon. The most notable Duke was Louis-Alexandre de Bourbon, born in 1720, who was a prominent figure in the 18th century. He was known for his wealth and influence, as well as his role in the French court. The title was created in 1734 and was associated with the region of Penthièvre in Brittany. The Duke was also a supporter of the arts and contributed to various cultural endeavors during his lifetime, reflecting the values of the French aristocracy of the period.