Medieval historians who have explored the abbey of Sithiu (modern Saint-Omer) have often done so to explain the competition between the canons of Saint-Omer and the monks of Saint-Bertin, a rivalry deriving from their shared origins in the abbey of Sithiu. However, David Defries's book centers on the cooperative relationship that developed between the saints Omer and Bertin in the monks' collective memory. Throughout the early Middle Ages, the...