Papa described to us Warkworth Castle, which stands further south, above the banks of the Coquet river, on a high wood-covered hill.  The greater portion of the ruins remain; indeed, the woodwork alone has disappeared, and the masonry is in so good a state of preservation, that the late Duke of Northumberland proposed to restore it, and make it his residence, instead of Alnwick Castle.  Near it a hermit dwelt in a cavern: he became a hermit in consequence of having killed the brother of his betrothed, whom he mistook for a rival, after his return from the Crusades.