Benedict XV was the pope of the Catholic Church from 1914 to 1922. There are several synonyms that can be used to refer to him, such as Giacomo della Chiesa, his birth name. He is also known as Pope Benedict XV, Holy Father Benedict XV, and Bishop of Rome Benedict XV. Other nicknames that he has received include "the Peace Pope" and "the Pope of the World War". Benedict XV was known for his strong opposition to World War I and his efforts to promote peace throughout the world. He was also a great advocate for social justice and helped to improve conditions for the poor and working classes.