Iran / Persia: Joseph Stalin, Franklin D. Roosevelt, Winston Churchill (left to right). The 'Big Three' at the Tehran Conference, 28 November - 1 December 1943

The Tehran Conference was a strategy meeting held between Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill from 28 November to 1 December 1943. It was held in the Soviet Embassy in Tehran, Iran and was the first of the World War II conferences held between all of the 'Big Three' Allied leaders (the Soviet Union, the United States, and the United Kingdom). It closely followed the Cairo Conference which had taken place on 22-26 November 1943, and preceded the 1945 Yalta and Potsdam Conferences. Although all three of the leaders present arrived with differing objectives, the main outcome of the Tehran Conference was the commitment to the opening of a second front against Nazi Germany by the Western Allies. The conference also addressed relations between the Allies and Turkey and Iran, operations in Yugoslavia and against Japan as well as the envisaged post-war settlement. A separate protocol signed at the conference pledged the Big Three's recognition of Iran's independence. (Photo by: Pictures From History/Universal Images Group via Getty Images)