The hagiographers Lisiard and Hariulf pictured St Arnulf, Bishop of Soissons and supposed founder of the Abbey of Oudenburg in Flanders (d. 1087), as a peacemaker. During his life, the holy man fell victim to the struggle for power between secular and ecclesiastical princes. Also Lisiard and Hariulf witnessed a great deal of violence as the result of the Investiture Controversy and communal revolts. Shortly after the St Arnulf's death, Lisiard started to compose the saint's Life, which Hariulf adapted in the first decades of the twelfth century. Both worked together to achieve his canonization, which was realized in 1121. This volume makes available some important narrative sources of the history of Flanders and Northern France in the eleventh and twelfth century century. In particular, these present an interesting insight in ideas on power and violence in theory and practice. Besides, the texts in a modern edition provide the means to enlarge our understanding of the hagiographic methods.