Name
- Salisbury, William, of Add MS 149291
- Seissylt Bryffwrch1
- Sevnyn1
- Sion Brwynog, alias Sion ab Hywel ab Llywelyn ab Ithel, alias y Kardiwr du1
- Sion Cent1
- Sovereigns of England1
- Thomas Brydydd1
- Thomas Wynn ab Edmwnt ab Rhys ab Rhobert ab Jevan Fychan1
- Trahaiarn Brydydd1
- Trevor, David, of Add MS 148661
- Tudyr Aled1
- Tudyr Ddall1
- Tudyr ab Gwyn Hagr1
- Tyssilio1
- Walters, John, of Add MS 150011
- William Cynwal, of Add MS 148661
- William Lleyn1
- Williams, Thomas, Dr; of Add MS 150231
- Williams, or Huallt1
- Y Mab Cryg1