With the coronation of Charlemagne by Pope Leo III in 800, his new title as Patricius Romanorum, and the handing over of the keys to the Tomb of Saint Peter, the papacy had acquired a new protector in the West. This freed the pontiffs to some degree from the power of the emperor in Constantinople but also led to a schism, because the emperors and patriarchs of Constantinople interpreted themselves as the true descendants of the Roman Empire dating back to the beginnings of the Church.[78] Pope Nicholas I had refused to recognize Patriarch Photios I of Constantinople, who in turn had attacked the pope as a heretic, because he kept the filioque in the creed, which referred to the Holy Spirit emanating from God the Father and the Son.