There are few views in Ireland more beautiful than that from the summit of the mound on which Cuchulainn's mansion stood. It may not be so extensive as other views in the locality, but for beauty and variety it can hardly be exceeded. If admittance is obtained into the house that is built on the track of Cuchulainn's, the view will be still finer. It is said by some that that house is haunted. It is to be hoped that it is; and that Cuchulainn's ghost will drive away sleep from the eyes of every one of Patrick Byrne's descendants who stop in it. The ancient name of the country round Dundalk was Muirimhne; but it has not been called by that name for some centuries. It appears to have been the patrimony of Cuchulainn; for in the tale, in the "Book of the Dun Cow," from which extracts have been given, Fann calls him, "Great chief of the plain of Muirimhne." He, probably, or the clan of which he was the head, owned all that part of northern Louth where the land is level, and up to the foot of the Cooley hills. All the County Louth is fairly studded with ruins of one sort or another. It is one of the most interesting counties in Ireland in an antiquarian point of view. It contains the remains of nearly thirty castles in almost all stages of preservation. One of the finest of them is only a few hundred yards from the _dun_ of Cuchulainn. It is not in the least ruined, but its architecture shows it to be one of the oldest castles erected by the Anglo-Normans in Ireland. Its style is almost exactly that of the castle at Trim, which we know was built before the end of the twelfth century. Like Dunsochly Castle, near Finglas, in the County Dublin, the one near Cuchulainn's _dun_ must have been inhabited at a comparatively recent date, for modern windows have been opened on its front. The only light that was admitted into those old castles was what came through the narrow slits in the walls, about three feet long and six or eight inches wide. These served the double purpose of letting in light and discharging arrows through them. It does not seem to be known by whom the very fine Norman Keep at Castletown, County Louth, was built. There are many larger castles of the same kind in different parts of Ireland, but there are not many of its age in such a good state of preservation. There is a church in the immediate proximity of the castle, and the exact date of its erection seems also unknown. It is in a state of almost utter ruin. The County Louth can boast of having been the birth-place of St Brigit. She was born at Fachart, only a few miles from Castletown, but it was in Kildare she spent almost all her life, and it was there she died and was buried.