Name
- Thomas, Humphrey1
- Thomas, John, Reverend; Schoolmaster of Beaumaris1
- Thomas, Morys1
- Thomas, Robert, of Llanfair Talhaiarn1
- Trevor, Edward1
- Trevor, John, of Add MS 148911
- Tyssilio1
- University of Oxford1
- Vaughan, John, of Add MS 148881
- Vaughan, Thomas, of Add MS 148801
- William Penllyn1
- William ab Hywel ab Thomas1
- William ab Rees1
- William ab W-1
- William, Davydd1
- William, Harri1
- Williams, David, alias Davydd Emlyn1
- Williams, David, of Bodeulywn1
- Williams, Edward, alias Jorwerth Morganwg, alias Jorwerth Gwilym1
- Williams, Evan, of Add MS 149361