Separation of Church of England (1534). The Church of England is the established church of England. The Archbishop of Canterbury is the most senior cleric, although the monarch is the supreme governor. The Church of England is also the mother church of the international Anglican Communion. It traces its history to the Christian church recorded as existing in the Roman province of Britain by the third century, and to the 6th-century Gregorian mission to Kent led by Augustine of Canterbury. The English church renounced papal authority when Henry VIII failed to secure an annulment of his marriage to Catherine of Aragon in 1534. The English Reformation accelerated under Edward VI's regents, before a brief restoration of papal authority under Queen Mary I and King Philip. The Act of Supremacy 1558 renewed the breach, and the Elizabethan Settlement charted a course enabling the English church to describe itself as both catholic and reformed: catholic in that it views itself as a part of the universal church of Jesus Christ in unbroken continuity with the early apostolic church. This is expressed in its emphasis on the teachings of the early Church Fathers, as formalised in the Apostles', Nicene, and Athanasian creeds. reformed in that it has been shaped by some of the doctrinal principles of the 16th-century Protestant Reformation, in particular in the Thirty-Nine Articles of Religion and the Book of Common Prayer. In the earlier phase of the English Reformation there were both Catholic martyrs and radical Protestant martyrs. The later phases saw the Penal Laws punish Roman Catholic and nonconforming Protestants. In the 17th century, the Puritan and Presbyterian factions continued to challenge the leadership of the Church which under the Stuarts veered towards a more catholic interpretation of the Elizabethan Settlement especially under Archbishop Laud and the rise of the concept of Anglicanism as the via media. After the victory of the Parliamentarians the Prayer Book was abolished and the Presbyterian and Independent factions dominated. The Episcopacy was abolished. The Restoration restored the Church of England, episcopacy and the Prayer Book. Papal recognition of George III in 1766 led to greater religious tolerance. Since the English Reformation, the Church of England has used a liturgy in English. The church contains several doctrinal strands, the main three known as Anglo-Catholic, Evangelical and Broad Church. Tensions between theological conservatives and progressives find expression in debates over the ordination of women and homosexuality. The church includes both liberal and conservative clergy and members. The governing structure of the church is based on dioceses, each presided over by a bishop. Within each diocese are local parishes. The General Synod of the Church of England is the legislative body for the church and comprises bishops, other clergy and laity. Its measures must be approved by both Houses of Parliament. Main article: History of the Church of England Main articles: History of Christianity in England and Anglo-Saxon Christianity According to tradition, Christianity arrived in Britain in the 1st or 2nd century, during which time southern Britain became part of the Roman Empire. The earliest historical evidence of Christianity among the native Britons is found in the writings of such early Christian Fathers as Tertullian and Origen in the first years of the 3rd century. Three Romano-British bishops, including Restitutus, are known to have been present at the Council of Arles in 314. Others attended the Council of Serdica in 347 and that of Ariminum in 360, and a number of references to the church in Roman Britain are found in the writings of 4th century Christian fathers. Britain was the home of Pelagius, who opposed Augustine of Hippo's doctrine of original sin. While Christianity was long established as the religion of the Britons at the time of the Anglo-Saxon invasion, Christian Britons made little progress in converting the newcomers from their native paganism. Consequently, in 597, Pope Gregory I sent the prior of the Abbey of St Andrew's from Rome to evangelise the Angles. This event is known as the Gregorian mission and is the date the Church of England generally marks as the beginning of its formal history.