How Did Gregory Improve the Church's Discipline?

Gregory was a man of the people. He converted lombards in northern italy, who were germanic and he wanted to incorporate them as christians. Also worked against donotism, which is a heresy in north africariht. Promoted benedictine order that would be front line for missionary movement coming down from celtic land. And this is going to be really important, because the church was never free from the roman empire.