Charles Pierre François Augereau, 1st Duke of Castiglione was a French military commander and a Marshal of the Empire who served during the French Revolutionary Wars and the Napoleonic Wars. After serving in the Revolutionary Wars, he earned rapid promotion while fighting against Spain and soon found himself as a division commander under Napoleon Bonaparte in Italy. He fought in all of Bonaparte's battles of 1796 with great distinction. During the Napoleonic Wars, Napoleon entrusted Augereau with important commands. His life ended under a cloud because of his poor timing in switching sides between Napoleon and King Louis XVIII of France. Napoleon wrote of Augereau that he "has plenty of character, courage, firmness, activity; is inured to war; is well liked by the soldiery; is fortunate in his operations.". Augereau is generally counted as one of the most capable generals of the Napoleonic Wars.

Marshal of the Empire was a civil dignity during the First French Empire. It was created by Sénatus-consulte on 18 May 1804 and to a large extent reinstated the formerly abolished title of Marshal of France. According to the Sénatus-consulte, a Marshal was a grand officer of the Empire, entitled to a high-standing position at the court and to the presidency of an electoral college.