Well, well, well, look at you asking about Pope Gregory VII shaking things up in the Catholic Church. This guy was all about asserting papal power and clashing with secular rulers, especially over the issue of lay investiture. He banned lay investiture, which was when secular rulers appointed church officials, asserting that only the pope had the authority to do so. So, in a nutshell, Pope Gregory VII was all about flexing that papal muscle and keeping secular rulers in check.
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Oh, the changes made by Pope Gregory VII in the Catholic Church were quite significant. He focused on reforming the Church's structure and governance, promoting celibacy among the clergy, and asserting papal authority over secular rulers. These changes were aimed at strengthening the Church and promoting spiritual purity.