subject the Greek church to the Roman church. I will always be a faithful and devoted son and defender of the Roman church. I will make a general law and cause it to be observed always and everywhere in my empire that whoever shall be excommunicated by the pope shall be under the ban of the empire. Furthermore, in order that this league of peace and friendship between the pope and me may be observed forever, and that all grounds for suspicion may be removed, and that he may always be to me a most gracious father and I a most faithful son to him, I will give my daughter to his nephew in marriage, and any other members of my family, male or female, I will cause to be joined in marriage to members of his family, as the pope may desire. I will make full satisfaction to God and to the church for all my offences, as the pope may command. These things were done in the presence of the bishop of Constance, etc. {75} See no. 103, note 73. 134. Promise of Frederick II to Innocent III, 1213. Migne, 217, cols. 301 ff. The powerful personality of Innocent III impressed itself deeply on the young king, Frederick II. The boy was truly devoted to Innocent, who was his guardian, and was willing to do whatever the pope required of him. In 1213 he wrote the following letter to Innocent in which he concedes practically everything for which the popes had been struggling. If the emperor had kept these promises, there would have been no further contest between the papacy and the empire. But as he grew older, and became conscious of his position, and learned what the imperial claims were, he gradually reasserted them and so renewed the conflict which ended in the destruction of his family.