In South Wales also is situated the bishopric of Landaff, near the Severn sea, and near the noble castle of Caerdyf; bishop Teilo being its patron. It contains five cantreds, and the fourth part of another, namely, Senghennyd. In North Wales, between Anglesey and the Eryri mountains, is the see of Bangor, under the patronage of Daniel, the abbot; it contains about nine cantreds. In North Wales also is the poor little cathedral of Llan-Elwy, or St. Asaph, containing about six cantreds, to which Powys is subject. CHAPTER V OF THE TWO MOUNTAINS FROM WHICH THE NOBLE RIVERS WHICH DIVIDE WALES SPRING WALES is divided and distinguished by noble rivers, which derive their source from two ranges of mountains, the Ellennith, in South Wales, which the English call Moruge, as being the heads of moors, or bogs; and Eryri, in North Wales, which they call Snowdon, or mountains of snow; the latter of which are said to be of so great an extent, that if all the herds in Wales were collected together, they would supply them with pasture for a considerable time. Upon them are two lakes, one of which has a floating island; and the other contains fish having only one eye, as we have related in our Itinerary. We must also here remark, that at two places in Scotland, one on the eastern, and the other on the western ocean, the sea-fish called mulvelli (mullets) have only the right eye. The noble river Severn takes its rise from the Ellennith mountains, and flowing by the castles of Shrewsbury and Bridgenorth, through the city of Worcester, and that of Gloucester, celebrated for its iron manufactories, falls into the sea a few miles from the latter place, and gives its name to the Severn Sea. This river was for many years the boundary between Cambria and Loegria, or Wales and England; it was called in British Hafren, from the daughter of Locrinus, who was drowned in it by her step-mother; the aspirate being changed, according to the Latin idiom, into S, as is usual in words derived from the Greek, it was termed Sarina, as hal becomes _sal_; hemi, _semi_; hepta, _septem_. The river Wye rises in the same mountains of Ellennith, and flows by the castles of Hay and Clifford, through the city of Hereford, by the castles of Wilton and Goodrich, through the forest of Dean, abounding with iron and deer, and proceeds to Strigul castle, below which it empties itself into the sea, and forms in modern times the boundary between England and Wales. The Usk does not derive its origin from these mountains, but from those of Cantref Bachan; it flows by the castle of Brecheinoc, or Aberhodni, that is, the fall of the river Hodni into the Usk (for Aber, in the British language, signifies every place where two rivers unite their streams); by the castles of Abergevenni and Usk, through the ancient city of Legions, and discharges itself into the Severn Sea, not far from Newport.