About a mile lower is the island of Pfaltz, or Pfalzgrafenstein, a place of such antient importance in the history of the Palatinate, that it has given its name to the whole territory in Germany called Pfaltz. It was probably the first residence of the Counts, the peaceable possession of which was one means of attesting the right to the Palatinate; for, as a sign of such possession, it was antiently necessary, that the heir apparent should be born in a castle, which still subsists in a repaired state upon it. This melancholy fortress is now provided with a garrison of invalids, who are chiefly employed in guarding state prisoners, and in giving notice to the neighbouring toll-house of Kaub, of the approach of vessels on the Rhine. Being much smaller than is suitable to the value placed upon it, it is secured from surprise by having no entrance, except by a ladder, which is drawn up at night.