 In late 971, he was an ambassador to the Byzantine court in Constantinople, in order to arrange the marriage of Otto's heir, Otto II, to the Byzantine princess Theophanu in April 972 in Rome.On that journey he also brought back some relics of Saint Pantaleon for the dedication of the new St. Pantaleon's Church in Cologne.In 972 he attended a synod at Ingelheim, and the next year was present at the emperor's funeral.