Like his predecessor Anselm I, who counselled Bernard to rebel in 817, Angilbert counselled the King of Italy, this time Lothair I, to revolt against his imperial sovereign in 833. In 837, he acted as an intermediary between Lothair and the emperor Louis the Pious. In 844 and again in May 859, after Lothair had attained the emperorship, Anselm was appointed to act as missus dominicus in his province. In the former year, he was in Rome for the coronation of Louis II as rex Langobardorum on 15 June. He was there again in April 850 for Louis's imperial coronation.