the Welsh principality of Powys, but lost much territory first by the Mercian encroachment marked by Watt's dyke and again by the construction of Offa's dyke, soon after 798. Nothing is known of the history of the diocese during the disturbed period that followed. Domesday Book gives scanty particulars of a few churches but is silent as to the cathedral. Early in the twelfth century, Norman influence asserted itself and in 1143 Theobald, Archbishop of Canterbury, consecrated one Gilbert as Bishop of St. Asaph, but the position of his successors was very difficult and one of them, Godfrey, was driven away by poverty and the hostility of the Welsh. A return made in the middle of the thirteenth century (British Library, Cotton MSS, Vitellius, c. x.) shows the existence of eight rural deaneries, seventy-nine churches, and nineteen chapels. By 1291 the deaneries had been doubled in number and there were Cistercian houses at Basingwerk, Aberconway, Strata Marcella and Valle Crucis, and a Cistercian nunnery, Llanllugan Abbey. The cathedral, which had been burnt in the wars, was rebuilt and completed in 1295. It was a plain massive structure of simple plan, and was again destroyed during the English succession Wars of the Roses. When it was restored by Bishop Redman the palace was not rebuilt and thus the bishops continued to be nonresident. At the end of the fifteenth century there was a great revival of church building, as is evidenced by the churches of that date still existing in the diocese. The chief shrines in the diocese were St. Winefred's Well, St. Garmon in Yale (), St. Dervel Gadarn in Edeirnion, St. Monacella at Pennant and the Holy Cross in Strata Marcella. All these were demolished at the Anglican Reformation. At that time the diocese contained one archdeaconry, sixteen deaneries and one hundred and twenty-one parishes. The bishop at this time had five episcopal residences, four of which were assumed by the Church of England bishop under Edward VI. The Report of the Commissioners appointed by his Majesty to inquire into the Ecclesiastical Revenues of England and Wales (1835) found the see had an annual net income of £6,301. This made it the wealthiest diocese in Wales and the fourth richest in Britain after Canterbury, London and Winchester. Lists of archdeacons Archdeacons of St Asaph Archdeacons of Montgomery The archdeaconry was created from that of St Asaph on 6 February