Question: Which was built first,  Cathedral of St John the Evangelist, Portsmouth or Brecon Cathedral?
Context: Brecon Cathedral, (Welsh: "Eglwys Gadeiriol Aberhonddu" ) in the town of Brecon, Powys, is the cathedral of the Diocese of Swansea and Brecon in the Church in Wales and seat of the Bishop of Swansea and Brecon.  Previously the church of Brecon Priory and then the Parish Church of St John the Evangelist, it became Brecon Cathedral following the disestablishment of the Church in Wales in 1920 and the creation of the diocese in 1923. St Margaret was an ancient parish in the City and Liberty of Westminster and the county of Middlesex.  It included the core of modern Westminster, including the Palace of Westminster and the area around, but not including Westminster Abbey.  In 1727 it was divided into St Margaret's and St John's, to coincide with the building of the Church of St John the Evangelist, constructed by the Commission for Building Fifty New Churches in Smith Square to meet the demands of the growing population, but there continued to be a single vestry for the parishes of St Margaret and St John.  This was reformed in 1855 by the Metropolis Management Act, and the two parishes formed the Westminster District until 1887.  In 1889 St Margaret and St John became part of the County of London.  The vestry was abolished in 1900, to be replaced by Westminster City Council, but St Margaret and St John continued to have a nominal existence until 1922. Born in Nottingham on 20 October 1926, he was educated at Nottingham High School and St John's College, Cambridge.  After National Service with the RAF Educational Service he was ordained in 1952.  He was an Assistant Curate St Mary’s, Radcliffe-on-Trent and then Residential Chaplain to the Bishop of Portsmouth until 1959.  He was Chaplain at Canford School from 1959 until 1972 when he became Vicar of St John’s, Oakfield, Ryde.  From 1975 to 1985 he was Director of Religious Education in the Portsmouth Diocese and a Residential Canon of its Cathedral.  After this he became Archdeacon of Portsmouth. St John's Cathedral (in full, The Cathedral Church of St John the Evangelist) is the Anglican cathedral in Mthatha, South Africa.  It is the seat of the Bishop of the Anglican Diocese of Mthatha. Cockbill was educated at Bristol Grammar School and St John's College, Oxford.  He was ordained in 1911 and began his career with curacies at St John’s, Bridgwater and Holy Trinity, Eltham.  He held incumbencies at All Saints, Oakhill, Holy Trinity, Bath and St John the Evangelist, Digswell.  He was diocesan director of religious education for the Diocese of St Albans from 1935 to 1948; and a canon residentiary of its cathedral from 1942 to 1958. The Diocese of Swansea and Brecon was established as a Diocese of the Church in Wales in 1923 with Brecon Priory as the Cathedral.  The area of the Diocese had formerly been the Archdeaconry of Brecon within the Diocese of St David's.  The Diocese has a border with five other Welsh Dioceses, as well as with the English Diocese of Hereford. The succentor ("under-singer") is the assistant to the precentor, typically in an ancient cathedral foundation, helping with the preparation and conduct of the liturgy including psalms, preces and responses.  In English cathedrals today, the priest responsible for liturgy and music is usually the precentor, but some cathedrals, such as St Paul's and Durham, retain a succentor as well.  Lichfield used the title "subchanter".  Westminster Abbey also retains the tradition; Brecon Cathedral has only a succentor, and no precentor.  The succentor is normally a minor canon. Cathedral of St John The Evangelist is the Mother Church of the Roman Catholic Archdiocese of Kuala Lumpur and the seat of its Archbishop, Julian Leow Beng Kim.  The first Church on a nearby site was established in 1883, and consisted of a long wooden hall with a few windows built on a forested area of Bukit Nanas, and was dedicated to St John the Evangelist.  It was later rebuilt with bricks walls and tile roofed, and today is used as The Community Services Centre".  The current building was built in 1954 and completed in 1955 and consecrated in 1962, when it was also elevated to the status of cathedral.  The building is known for its whitewashed exterior and twin spires at the west front.  It also includes stained glass windows from Paris, depicting scenes from the Gospel. The Cathedral Church of St John the Evangelist (also known as St John's Cathedral) is a Roman Catholic cathedral in Portsmouth, England.  It was opened in 1882 and is the first cathedral to have been built in Portsmouth.  It is the mother church of the Portsmouth diocese and seat of the Bishop of Portsmouth, currently the Right Reverend Philip Egan.  It was dedicated on 10 August 1882. The Very Rev Geraint Morgan Hugh Hughes, MA(Oxon) was an eminent Anglican Priest in the late 20th century.  He was born into an ecclesiastical family on 21 November 1934 and educated at Brecon Grammar School, Keble College, Oxford, and St. Michael's College, Llandaff.  After National Service in the RAF he was ordained in 1959.  He served curacies at Gorseinon and Oystermouth; and then held incumbencies at Llanbadarn Fawr and Llandrindod.  He was a Canon at Brecon Cathedral from 1989 to 1998 when he became its Dean, a post he held for two years.
Answer: St John's Cathedral