The famous conqueror known for his extensive campaigns was Alexander the Great. He ruled from 336 to 323 BC and established one of the largest empires in ancient history, stretching from Greece through Asia Minor, Egypt, Persia, and into India. His military genius and use of phalanx tactics revolutionized warfare. Through his conquests, he spread Hellenistic culture, blending Greek and Eastern influences, which had lasting effects on the regions he conquered. Alexander's ambition and accomplishments earned him a legendary status, making him one of the most renowned figures in history.