PEMBROKE CASTLE is a noble ruin, seated on a cliff above the river. Caradoc of Llancaroon says, that it was founded by Arnulph, son to the Earl of Shrewsbury, anno 1094; but Giraldus Cambrensis fixes the time of its erection in the reign of Henry the First, and the rounded arches that occur in the building determine its foundation not to have been later than that prince’s reign. The most remarkable features of this ruin are, the grand entrance, which is still entire; and the juliet, or high round tower, the antient citadel, which has still the “Rofe of stone almost in conum; the top whereof is covered with a flat mille stone;” as described by Leland. The walls of this tower are fourteen feet in thickness; its diameter within is twenty-five feet, and its height to the top of the dome seventy-five feet: from mortices in the walls, this tower appears to have been divided into four floors. The ruined chapel also is a conspicuous object viewed externally;—and immediately underneath it, in the body of the rock, is the Wogan, a grand cavern deemed natural: if it be so, however, Nature has taken more pains in turning it correctly circular, and raising its elevated roof, than she generally is found to have done in works of this kind. Its diameter is fifty-three feet; and just within the entrance we observed a spiral staircase which led through the rock to the chapel within the castle. From the foundations of an outwork, which we traced among shrubs and brambles on the margin of the river, opposite the cavern’s mouth, it appears to have been less a place of concealment than an avowed sally-port, or regular entrance from the river. The castle is remarkable in history for having been the birth-place of Henry the Seventh; and also for the gallant defence that it made for Charles the First.