Constantin Prezan (January 27, 1861 Butimanu, Dâmboviţa County – August 27, 1943) was a Romanian general during World War I and a Marshal of Romania afterward. General Prezan commanded the 4th Army Corps in 1915-1916, and then became head of the Romanian Fourth Army during the Romanian Campaign later in 1916. Prezan led the Romanian Armed Forces as it retreated into the northeastern part of Romania (Moldavia), and also in the Battle of Bucharest (November 1916). In July and August 1917, Prezan, who was by then Chief of the General Staff (and assisted by the then-Lieutenant-Colonel Ion Antonescu) successfully stopped the German invasion led by Field Marshal August von Mackensen. He continued serving in this position until 1920. Prezan was promoted as Marshal of Romania in 1930.