Giacomo della Chiesa was an Italian cardinal who served as the Pope from 1914 until his death in 1922. He was known for his diplomatic skills and his efforts to promote peace during World War I. Some synonyms that can be used to refer to Giacomo della Chiesa are Pope Benedict XV, Cardinal della Chiesa, and the Holy Father. Benedict XV was the name he took when he became Pope, while Cardinal della Chiesa was his official title before he ascended to the papacy. The term "Holy Father" is a traditional reference to the Pope in the Catholic Church.