Jérôme-Napoléon Bonaparte (15 November 1784 – 24 June 1860) was the youngest brother of Napoleon I and reigned as Jerome I, King of Westphalia, between 1807 and 1813. From 1816 onward, he bore the title of Prince of Montfort. After 1848, when his nephew, Louis Napoleon, became President of the French Second Republic, he served in several official roles, including Marshal of France from 1850 onward, and President of the Senate in 1852.