 In 860, according to an account by the Norman monk Dudo of Saint-Quentin, a Viking fleet, probably under Björn Ironside and Hastein, landed in Sicily, conquering it.Many Norsemen fought as mercenaries in Southern Italy, including the Varangian Guard led by Harald Hardrada, who later became king of Norway, who conquered Sicily between 1038 and 1040, with the help of Norman mercenaries, under William de Hauteville, who won his nickname "Iron Arm" by defeating the emir of Syracuse in single combat, and a Lombard contingent, led by Arduin.The Varangians were first used as mercenaries in Italy against the Arabs in 936.