Pope Gregory II served as the head of the Roman Catholic Church from 715 to 731 AD. He is known for his efforts to strengthen the church's authority and expand its influence in Europe. During his papacy, he supported missionary work, particularly in regions like Germany, where he encouraged the spread of Christianity. Additionally, Pope Gregory II played a significant role in the conflict between the Byzantine Empire and the Lombards. He opposed the Byzantine Emperor's policies, particularly the iconoclasm movement, which sought to destroy religious images. His leadership helped solidify the papacy's independence and authority during a turbulent period.