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History is often written by kings and emperors, but the map of the modern world was shaped by a group of men who started with nothing but a message. They were the Sahaba—the Companions. But among them, four stood taller than the rest. They weren't just leaders; they were the closest friends of the Prophet Muhammad (PBUH). Today, we look at the Rashidun—the Rightly Guided Caliphs—and how their four distinct personalities built an empire that stretched from the Atlantic to the Himalayas.