In 1232, Frederick came to terms with Pope Gregory, confirmed the "Statutum", and had Henry swear obedience in Cividale. In the same year, Henry renewed the league between the Hohenstaufen and the French royal Capetian dynasty. In the following year he entered into a conflict with the House of Wittelsbach and subdued Otto II of the Palatinate, the son of Duke Louis of Bavaria. Frederick, fearing the discontent of the German princes, demanded the release of all hostages. In 1233/34, however, Henry made his father angry again, when he intervened against some inquisition measures, especially the Archbishop of Bremen's crusade against rebellious peasants of Stedingen. Pope Gregory IX, who had authorised the crusade, excommunicated Henry. Emperor Frederick outlawed his son on 5 July 1234 and announced his return to Germany.