In 1937, after the Italian conquest of Ethiopia during the Second Italo-Abyssinian War, the Duke of Aosta replaced Marshal Graziani as Viceroy and as Governor-General of Italian East Africa. It was generally conceded that he was a vast improvement over Graziani. As Viceroy and Governor-General, the Duke of Aosta was also the Commander-in-Chief of all Italian military forces in Eritrea, Ethiopia, and Italian Somaliland.