Gregory's consecration was delayed until 29 March 828, when he received notice of the Emperor Louis the Pious’ approval of his election. This delay was enforced by the imperial envoys, who insisted that the Constitution of 824 expressly forbid the consecration of any pope-elect until the emperor had satisfied himself of the validity of the election. It was said that the emperor reprimanded Gregory for attempting to have himself consecrated before receiving the approval of the emperor. Gregory complied with these demands of imperial supremacy, and in 828 and 829, the pope sent embassies to Louis for unspecified discussions.