Answer:
Gregory VII's ban on lay investiture was a key element of the reform, ultimately contributing to the centralized papacy of the later Middle Ages. The reform of the Church, both within it, and in relation to the Holy Roman Emperor and the other lay rulers of Europe, was Gregory VII's life work.
Step-by-step explanation:
Gregory VII's ban on lay investiture was a key element of the reform, ultimately contributing to the centralized papacy of the later Middle Ages. The reform of the Church, both within it, and in relation to the Holy Roman Emperor and the other lay rulers of Europe, was Gregory VII's life work.