Louis-Alexandre Berthier
Louis Alexandre Berthier, 1st Prince de Wagram, 1st Duc de Valangin, 1st Sovereign Prince de Neuchâtel (February 20, 1753 – June 1, 1815), was a Marshal of France, Vice-Constable of France beginning in 1808, and Chief of Staff under Napoleon.
Read more about Louis-Alexandre Berthier: Early Life, Military Career, Marriage and Family