Title: Pope Gregory I
Content:  he was known as "the Father of Christian Worship" because of his exceptional efforts in revising the Roman worship of his day. His contributions to the development of the Divine Liturgy of the Presanctified Gifts, still in use in the Byzantine Rite, were so significant that he is generally recognized as its de facto author. Gregory is one of the Latin Fathers and a Doctor of the Church. He is considered a saint in the Catholic Church, Eastern Orthodox Church, Anglican Communion, various Lutheran denominations, and other Protestant denominations. Immediately after his death, Gregory was canonized by popular acclaim. The Protestant reformer John Calvin admired Gregory greatly and declared in his Institutes that Gregory was the last good Pope. He is the patron saint of musicians, singers, students, and teachers.
Title: Church Fathers
Content:  Gregory I the Great (c. 540 – 604) was pope from 3 September 590 until his death. He is also known as Gregorius Dialogus (Gregory the Dialogist) in Eastern Orthodoxy because of the Dialogues he wrote. He was the first of the popes from a monastic background. Gregory is a Doctor of the Church and one of the four great Latin Fathers of the Church (the others being Ambrose, Augustine, and Jerome). Of all popes, Gregory I had the most influence on the early medieval church.
Title: Pope Gregory I
Content:  Pope Gregory I (Gregorius I; c. 540 – 12 March 604), commonly known as Saint Gregory the Great, was the bishop of Rome from 3 September 590 to his death. He is known for instigating the first recorded large-scale mission from Rome, the Gregorian Mission, to convert the then-pagan Anglo-Saxons in England to Christianity. Gregory is also well known for his writings, which were more prolific than those of any of his predecessors as pope. The epithet Saint Gregory the Dialogist has been attached to him in Eastern Christianity because of his Dialogues. English translations of Eastern texts sometimes list him as Gregory "Dialogos", or the Anglo-Latinate equivalent "Dialogus". A Roman senator's son and himself the prefect of Rome at 30, Gregory lived in a monastery he established on his family 
Title: Christianity in the 6th century
Content:  Saint Gregory I the Great was pope from September 3, 590 until his death. He is also known as Gregorius Dialogus (Gregory the Dialogist) in Eastern Orthodoxy because of the Dialogues he wrote. He was the first of the popes from a monastic background. Gregory is a Doctor of the Church and one of the four great Latin Fathers of the Church. Of all popes, Gregory I had the most influence on the early medieval church.
Title: Pope Gregory I and Judaism
Content:  Pope Gregory I (c.540-604), also known as Gregory the Great, was influential in the formation of Catholic doctrine in relation to the Jews. He was responsible for a notable Papal Bull which spoke of a requirement for Christians to protect and defend the Jewish people, which became official doctrine. He publicly disapproved of the compulsory baptism of Jews, and insisted on their right to liberty of action, both in civil affairs and in their worship.
Title: Pope Gregory I
Content:  before becoming a papal ambassador and then pope. Although he was the first pope from a monastic background, his prior political experiences may have helped him to be a talented administrator. During his papacy, his administration greatly surpassed that of the emperors in improving the welfare of the people of Rome, and he challenged the theological views of Patriarch Eutychius of Constantinople before the emperor Tiberius II. Gregory regained papal authority in Spain and France and sent missionaries to England, including Augustine of Canterbury and Paulinus of York. The realignment of barbarian allegiance to Rome from their Arian Christian alliances shaped medieval Europe. Gregory saw Franks, Lombards, and Visigoths align with Rome in religion. He also combated the Donatist heresy, popular particularly in North Africa at the time. Throughout the Middle 
Title: Pope Gregory I
Content:  The namesake church of San Gregorio al Celio (largely rebuilt from the original edifices during the 17th and 18th centuries) remembers his work. One of the three oratories annexed, the oratory of Saint Silvia, is said to lie over the tomb of Gregory's mother. In England, Gregory, along with Augustine of Canterbury, is revered as the apostle of the land and the source of the nation's conversion.
Title: Gregory the Bulgarian
Content:  Born in Ottoman Bulgaria, Gregory was an Eastern Orthodox Christian. He became an aide to Isidore, Metropolitan of Kiev and All Rus', who signed the act of union with the Roman Church on behalf of the Russian Church at the Council of Florence in 1439. In 1458, he was appointed as the metropolitan of the newly-established Kiev see by the titular Latin Patriarch Gregory Mammas of Constantinople on agreement of the Pope Pius II. Election Gregory was also supported by most of diocesan bishops of the original Old Russian Church among which were bishops of Przemysl, Chelm, Halych, Turow, Volodymyr, 
Title: Gregory VII of Cilicia
Content:  end of his reign the kingdom was in an era of peace, so Gregory saw it as an opportunity to propose better regulations for ecclesiastical customs and ceremonies. He composed a religious creed which he gave to King Levon III but then suddenly took ill and died. The king convened the head of clergy throughout the land to go to Sis where Gregory's creed was read and certain canons enacted, one of which acknowledged the dual-nature of Christ, a belief from the Greek church which had long made the Armenian church opposed to it as the Armenian church was miaphysite. This meeting also elected a new Catholicos, none other than the previous Catholicos Constantine II the Woolmaker. Gregory was the uncle of another Catholicos, Jacob II of Cilicia.
Title: Gregory III of Constantinople
Content:  He was tonsured as a monk in ca. 1420, and is considered to have been the confessor of Emperor John VIII Palaiologos. He was a supporter of the Union with the Roman Catholic Church. He played a very active role in the theological discussions. He participated in the preliminary negotiations with Rome at the Council of Basle and later accompanied Patriarch Joseph II to the Council of Ferrara-Florence, where he also represented Philotheus of Alexandria. He was elected Patriarch after the death of the also-unionist Patriarch Metrophanes II. Gregory did his best to reconcile monks, the church hierarchy, and common people to the agreement reached at Ferrara-Florence, but in vain. He was opposed by George Scholarios and John Eugenikos, who wrote extensively against the Council. Leading anti-Unionist clergy refused to pray for the Emperor in their churches. In 1450, the tension in ecclesiastical circles grew so tense that Gregory left his post and arrived in Rome in August 1451. He was cordially received by Pope Nicholas V, who aided him financially. Pro-unionists in the Latin-occupied areas of Greece continued to consider him the legitimate patriarch of Constantinople.

Question: What is the religion of Gregory I?
Answer: Christianity.
Christian faith.