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.