 In 1110 he moved to Italy and, after negotiation failed, captured Pope Paschal II and several cardinals to enforce his coronation as Holy Roman Emperor.Having returned from Rome he was immediately excommunicated by the papal legate in Germany Cuno of Praeneste and again by Archbishop Guy de Vienne, the later Pope Callixtus II, which encouraged the Imperial princes in their rising against the emperor—most of all the Saxon Duke Lothair of Supplinburg and Archbishop Adalbert of Mainz, Henry's long-time supporter who after his investiture had deserted him.Henry entrusted the Saxon affairs to his field marshal Count Henry of Mansfeld, a Saxon noble himself.