1. Pen Oyle

      Home of the giant Oyle. The place cannot be identified with certainty.

    2. Pen Palach
      'Cudgel Head'

      A monster slain by Arthur in the halls of Dissethach.

    3. Pen Rhionydd
      Penrhyn Rhionydd

      Arthurís northern capital, according to the Triads.

      It may have been in Scotland. Its name suggests that it is a cape, or the tip of a peninsula.

The Welsh pen, in geographical names, means the highest part or the extreme end, as of a mountain, a field, or a meadow. In Scotland there is ben, 'a mountain'; Gaelic cen or cenn with the same meaning as pen and ben. Some Scottish places are Benmore (Penmawr), 'great mountain'; Pencraig, 'top of the rock'; Penpont, 'end of the bridge', and so on. European names gives us information about the earlier Celtic settlements, such as Pennine, Penne, Penmark, and Apennines.