Rothad, bishop of Soissons, one of the most active members of the party in favour of the pseudo-Isidorian theories, immediately came into collision with his archbishop. Deposed in 863 at the council of Soissons that was presided over by Hincmar, Rothad appealed to Rome. Pope Nicholas I, supported him zealously, and in 865, in spite of the protests of the archbishop of Reims, Arsenius, bishop of Orte and legate of the Holy See, was instructed to restore Rothad to his episcopal see.