The legacy of the greatest teacher the world has known, the greatest man to ever walk the Earth, the Messenger of Allah (s), is attested to by the greatness of his students: the Sahabah, none more so than his four successors, the four men famed as the Righly Guided Caliphs. The Blessed Prophet's (s) words and deeds have reached us from across the centuries and still inspire billions. It was these men who were charged with carrying those teachings to others, and within one short century spread them across the breadth of the world. This book collects the teachings of these great; their words and their actions; how they lived and how they died. Each of them was a giant upon whose shoulders the great scholars and sages; the orators and leaders; the warriors and heroes; the ascetics and mystics in every age of this Ummah have built their places in the halls of history. Each of them was shaped for greatness by the blessed hands of the Beloved (s) in a singular and unique manner. Together, they built a community, an empire, and a legacy that shall inspire this Ummah until the end of all things.