Oathbreakers: The War of Brothers That Shattered an Empire and Made Medieval Europe

“Fascinating.” — The Wall Street Journal

“An enlightening portrait of the medieval mindset.” — Publishers Weekly

The authors of The Bright Ages return with a “real-life Game of Thrones” (New York Times Book Review)—the story of the Carolingian Civil War, a bloody, protracted battle pitting brother against brother, father against son, that would end an empire, upend a continent, and redefine the future of Europe

By the early ninth century, the Carolingian empire was at the height of its power....