1839 - 1918Person Name: B. WilliamsHymnal Number: 110Composer of "DEGANWY" in Hymnau a thonau at wasanaeth amrywiol gyfarfodydd y cysegrIdentified as the composer of DEGANWY in Maggie Humphreys and Robert Evans' Dictionary of Composers for the Church in Great Britain and Ireland, p.361.
1856 - 1932Hymnal Number: 174Author of "Er mor arw ydyw'r fordaith" in Hymnau a thonau at wasanaeth amrywiol gyfarfodydd y cysegrDates from the Dictionary of Welsh Biography.
1814 - 1902Person Name: John Jones, CwmygeifrHymnal Number: 47Composer of "LLYWARCH" in Hymnau a thonau at wasanaeth amrywiol gyfarfodydd y cysegrSee http://newspapers.library.wales/view/3839319/3839329/75/ Welsh Newspapers Online (http://newspapers.library.wales/view/3839319/3839329/75/) for an obituary. The National Library of Wales also has an excerpt. (http://papuraunewydd.llyfrgell.cymru/view/3295048)