THIRLWALL-CASTLE, (Northumberland) N. E. of Brampton, stands on that part of the Picts-Wall where it crosses the Tippil, near the Irthing, on the b. of Cumberland, and gave seat and surname to that ancient and honourable family, before called Wade. Here the Scots forced a passage into England; for having summoned in the boors, with their mattocks and pick-axes, they made gaps in the wall for their passage, from which gaps, this part of it was called Thirlwall, the Saxon signifying the same as the Latin words Murus perforatus. The castle, which is about 20 yards long and 12 broad, stands close by the N. side of the wall, has been curiously vaulted underneath, and its walls are 6 feet thick, and on the top are 6 little turrets.