Charles I, often known as Charlemagne, is one of the most extraordinary figures ever to rule an empire. Driven by unremitting physical energy and intellectual curiosity, he was a man of many parts, a warlord and conqueror, a judge who promised "for each their law and justice," a defender of the Latin Church, a man of flesh and blood. In the twelve centuries since his death, warfare, accident, vermin, and the elements have destroyed much of the writing on his rule, but a remarkable amount has survived. Janet Nelson's wonderful new book brings together everything we know about Charles I, sifting through the available evidence, literary and material, to paint a vivid portrait of the man and his motives.