Pope Sergius I served as the head of the Roman Catholic Church from 687 to 701 AD. He was known for his efforts to strengthen the papacy and improve relations with the Byzantine Empire. Sergius I also played a significant role in the development of liturgical practices, including the introduction of certain rituals that are still observed today. During his papacy, Sergius I faced challenges from various factions within Rome and worked to maintain peace and stability. He is remembered for his commitment to the church and his contributions to the early Christian community, particularly in the context of the growing influence of the Byzantine Empire.