A rich portrait of Frederick Barbarossa, the medieval monarch who ruled Germany in cooperation with the princes and whose legend inspired Hitler to label his invasion of the Soviet Union "Operation Barbarossa""Freed has done so much to illuminate the ins and out of German politics in the late tweflth century, ensuring that his book will be a constant point of reference for scholars."-David Abulafia, History TodayFrederick Barbarossa, born of two of Germany's most powerful families, swept to the imperial throne in a coup d'état in 1152. A leading monarch of the Middle Ages, he legalized the dualism between the crown and the princes that endured until the end of the Holy Roman Empire. This new biography, the first in English in four decades, paints a rich picture of a consummate diplomat and effective warrior. John Freed mines Barbarossa's recently published charters and other sources to illuminate the monarch's remarkable ability to rule an empire that stretched from the Baltic to Rome, and from France to Poland. Offering a fresh assessment of the role of Barbarossa's extensive familial network in his success, the author also considers the impact of Frederick's death in the Third Crusade as the key to his lasting heroic reputation. In an intriguing epilogue, Freed explains how Hitler's audacious attack on the Soviet Union in 1941 came to be called "Operation Barbarossa."