Who was the leader of a powerful alliance?

The leader of a powerful alliance often refers to figures like Franklin D. Roosevelt during World War II, who led the Allied Powers, which included nations such as the United Kingdom, the Soviet Union, and China against the Axis Powers. Alternatively, in a different context, it could refer to leaders like Otto Von Bismarck, who played a key role in forming the Triple Alliance of Germany, Austria-Hungary, and Italy in the late 19th century. Each of these leaders significantly influenced their respective alliances' strategies and outcomes in global conflicts.