In 1946 and 1948, James Conway Davies published volumes one and two of his Episcopal Acts and Cognate Documents Relating to Welsh Dioceses 1066-1272. A notice in the front of volume two indicates that volume three - promised for publication in 1950/1 but never released - would have contained inter alia the acts of the dioceses of Bangor and St Asaph and an index of the acts contained in all three volumes. The editor left behind a massive card index and the galley proofs of the acts of St Asaph and Bangor, and it is these that form the basis of the present volume. It therefore completes what is both a monumental study on and source of information for the Church in medieval Wales.