16 The two Gregories were succeeded by Zachary, heir to their pontificates and to their concern for the Germans and their apostle. Not content to renew the ancient union, he increased it by showing more confidence and good will toward Boniface. Boniface acted the same way toward Zachary, as the number of messengers and of friendly letters which were exchanged show us. Among other things, which would be too lengthy to recall, the pope addressed his representative in these friendly terms: "Beloved brother, know that we cherish you to the point of wanting to have you with us every day, to be our associate, as a minister of God, and steward of the Churches of Christ. It was therefore appropriate that the apostle of Germany wrote a few years before his death to Pope Stephen, Zachary's successor: "The disciple of the Roman Church resolutely asks from the bottom of his heart friendship and union with the Holy See."
Source: In Hac Tanta (Vatican.va)