DAVID'S, St., an ancient and decayed episcopal city of Wales, Pembrokeshire, situated on the small river Allan, 15 miles from Haverford-West. A religious establishment was founded here at a very early period, and appears to have been deemed of the highest importance by the ancient Britons. The ecclesiastical buildings suffered severely from a Danish force about 911; and were again much injured by Sweyne, the son of Harold, in 993. William the Conqueror, who entered Wales with a great army, visited this place as a pilgrim and devotee, and made an offering at the shrine of St David. The cathedral, episcopal palace, St Mary's College, and the other ecclesiastical buildings, were inclosed within a lofty embattled wall, more than 1200 yards in circumference, with four strong and handsome gateways. The present cathedral, occupying the site of the more ancient structure, is a venerable Gothic cruciform edifice, commenced in the reign of Henry I., and completed in that of John, but now in a very dilapidated state. A richly ornamented square tower, 127 feet high, surmounts the western end. The length of the building within the walls is 307 feet, of the nave 128, of the choir and chancel 99. The bishop's throne is of exquisite workmanship. Many of the tombs are old and curious. The aisles north and south of the chancel are roofless, and the cloisters and some other parts are mere heaps of ruins. Of the bishop's palace, founded by bishop Gower in the fourteenth century, and one of the most magnificent edifices of the kind in the kingdom, parts of two sides only remain. It appears to have formed a complete quadrangle, inclosing an area of 120 feet square. The grand entrance is a beautiful but ruined gateway. Of St Mary's College, founded by John of Gaunt in 1365, the only relic is a chapel which has long been without a roof. and is fast going to decay. The shrine of St David was for ages regarded as possessing a peculiar sanctity, and was resorted to by crowds of pilgrims. At the western extremity of the town is an ancient cross, where the market was formerly held. Besides the few clergy who perform duty in the cathedral, the inhabitants of St David's are chiefly labourers employed on the adjacent farms. Every part of the surrounding country was at one time covered with chapels, crosses, and sainted wells. It still abounds with relics of Druidical usages. St David's Head, the most western point of Wales, is a lofty, rugged, and gloomy promontory, about two miles N.W. of the city.