The establishment of a separate province and archbishopric was an indirect consequence of the Disestablishment of the Church of England in Wales (voted by Parliament in 1914 but implemented in 1920). Precedents for this development were sought by some in the early Celtic Church with a debatable pre-eminence of St. Davids. A Roman Catholic archbishopric of Cardiff had been created in 1916. The circulating character of the post was justified by Welsh geography and by the ecclesiastical precedent of the province of Numidia (of which St. Augustine of Hippo had been a bishop).
Successive archbishops have not only represented different geographical areas but also different tendencies within Anglicanism. In the mid- twentieth century lingustic issues were prominent in the successive incumbencies of Edwin Morris (who spoke no Welsh) and of Glyn Simon (who sympathised with advocates of the use of the Welsh language). Morris in some ways represented the broad churchmanship characteristic of the first occupant of the newly created post, Alfred Edwards, whereas Simon in many respects inherited the Anglo-Catholic outlook of the second archbishop, Charles Alfred Howell Green (but without his authoritarianism). Towards the end of his period in office Gwilym Williams was one of three leading Welsh figures in a deputation to guarantee the status of the language which had been challenged by Margaret Thatcher. He was also decisive in the decision to ordain women priests. The present Archbishop of Canterbury, Dr. Rowan Williams, held the post as Bishop of Monmouth.