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 304 Mediceval Military Architecture. There are some peculiarities of detail in this castle which need further investigation. The large windows of the first and second floors of the keep are original ; but the half-piers and bell-caps in the exterior jambs look much later, and may be a part of the Deco- rated additions. It is said that the buildings against the east wall received some alterations from another Roger de Clifford, grandson of the former. It is curious that walls so thick as those of the keep, and of such good material, should have been left solid, for the most part unpierced by the chambers and passages so much affected by the Norman architects. It is also to be observed that the curtain wall is but scantily furnished with flanking defences. Countess Anne mentions " the Tower of Leaguer," and " the Pagan Tower," and " the Greystoke State Chamber," in Brougham Castle. THE CASTLE OF BUILTH, IN BRECKNOCKSHIRE. THE name of Builth, borne at this time by a considerable town, and by a Hundred of the county of Brecknock, is very ancient. As, like Brecon, the town is placed in an open valley, accessible without much difficulty to an enemy from the east, it has suffered from invasion from a very early period, and to these and similar attacks are to be attributed various strongholds, both of earth and masonry, of which the remains are abundant upon the marches of England and Wales, and in such tracts of the latter territory as either Saxon or Norman, having overrun, thought it worth while to retain. The construction of Offa's Dyke, in the eighth century, must have been preceded by many years of conquest, and the establishment of many English strongholds throughout the annexed district, and probably also beyond it. Nothing short of a present inability to rise would have kept the Welsh quiet during the construction of such a work, or have forced them to accept, even passively, a limit which cut off a large part of their fairest territory. The fortresses of Builth and Brecon, which resemble in general character those of known English origin elsewhere, were probably advanced posts thrown up either during the wars which preceded the dyke, or to aid the aggressions which followed it. The plan of construction leads rather to the latter conclusion, and points to the ninth or early part of the tenth century. However this may be, it is certain that when Bernard Newmarch invaded Brecknock, towards the end of the eleventh century, he found the earthworks of Brecon and Builth already existing, and occupied them, as was usual, by works of a Norman character.