Career
He is known for his work in five books, named Liber gestorum recentium, a "book of the deeds of recent times". Arnulf"s history begins in 925, with Hugh of Arles ("Hugh of the Burgundians") reigning as King of Italy and exercising his right to appoint an archbishop of Milan. lieutenant covers the years of the Gregorian reforms, the reform movement of the Milanese Patarenes, and the Investiture Controversy.
lieutenant ends with the kingship granted to Rudolf von Rheinfeld as anti-king of the Germans (1077).