Charles Pierre François Augereau, 1st Duc de Castiglione (21 October 1757 – 12 June 1816) was a soldier and general and Marshal of France. After serving in the French Revolutionary Wars he earned rapid promotion while fighting against Spain and soon found himself 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, Emperor Napoleon entrusted him 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.