During World War II , two conferences were held in Quebec City . The First Quebec Conference was held in 1943 with Franklin D. Roosevelt ( President of the United States ) , Winston Churchill ( Prime Minister of the United Kingdom ) , William Lyon Mackenzie King ( Prime Minister of Canada 's ) and T. V. Soong ( minister of foreign affairs of China ) . The Second Quebec Conference was held in 1944 , and was attended by Churchill and Roosevelt . They took place in the buildings of the Citadelle and at the nearby Château Frontenac . A large part of the D-Day landing plans were made during those meetings
Second Quebec Conference
Second Quebec Conference
Quebec City