Why was Pope Gregory called "the Great"? He converted the Lombard invaders to Christianity.
O He made Rome the center of the western church.
O He stood up to the Eastern Patriarch.
O He began missionary work among European pagans.

The correct answer is D) He began missionary work among European pagans.

Pope Gregory was called "the Great" because he began missionary work among European pagans.

According to Roman history, Pope Gregory (540-604) was credited with being the first pope that organized a large mission to evangelize Anglo-Saxon tribes located in the British territory.

Pope Gregory was also known for his dedication to writing and spread religious knowledge among Catholic followers. He paid special attention to the importance of being clean -body and mind- before praying. Let's have in mind that taking baths was not a costume at that time in Europe.