Deugain Merthyr Lloegr a Chymru

Deugain Merthyr Lloegr a Chymru yw'r term a ddefnyddir am ddeugain o ferthyron Catholig a ganoneiddiwyd ar 25 Hydref 1970 gan Pab Pawl VI i gynrychioli'r holl Gatholigion a ferthyrwyd yn Lloegr a Chymru rhwng 1535 a 1679.

Sant John Almond Sant Edmund Arrowsmith Sant Ambrose Barlow Sant John Boste Sant Alexander Bryant Sant Edmund Campion Sant Margaret Clitherow Sant Philip Evans Sant Thomas Garnet Sant Edmund Gennings Sant Richard Gwyn Sant John Houghton Sant Philip Howard Sant John Jones

Sant John Kemble Sant Luke Kirby Sant Robert Lawrence Sant David Lewis Sant Anne Line Sant John Lloyd Sant Cuthbert Mayne Sant Henry Morse Sant Nicholas Owen Sant John Payne Sant Polydore Plasden Sant John Plessington Sant Richard Reynolds Sant John Rigby

Sant John Roberts Sant Alban Roe Sant Ralph Sherwin Sant John Southworth Sant Robert Southwell Sant John Stone Sant John Wall Sant Henry Walpole Sant Margaret Ward Sant Augustine Webster Sant Swithun Wells Sant Eustace White