Name
- Robin Ddu, of Add MS 148661
- Samuel, Edward1
- Saunders, R-1
- Simwnt Vychan1
- Sion Brwynog, alias Sion ab Hywel ab Llywelyn ab Ithel, alias y Kardiwr du1
- Sion Lewis1
- Sion Phylip1
- Sion Rogier1
- Sion ab Rhisiart Piers1
- Smart, Christopher, of Add MS 149361
- Thomas Kelli1
- Thomas ab Robert1
- Thomas, John, of Add MS 148781
- Tudyr Aled1
- Tudyrr Penllyn1
- Twm Tegid1
- Tyssilio1
- University of Oxford1
- Warburton, John, English antiquarian, cartographer and herald, 1682-1759, http://viaf.org/viaf/27696061
- William Matthew1