The answer is Genghis Khan. He began as the leader of a small band but gradually unified Mongol forces under his command, stretching their control to the eastern part of Europe and into the Near East.
Marcus Garvey was an orator for the Black Nationalism and Pan-Africanism movements, to which end he founded the Universal Negro Improvement Association and African Communities League. Garvey advanced a Pan-African philosophy which inspired a global mass movement, known as Garveyism.