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)
1849 - 1919Person Name: Gutyn ArfonHymnal Number: 58Composer of "LLEF" in Hymnau a thonau at wasanaeth amrywiol gyfarfodydd y cysegrAlso used the names Gutyn Arfon and Griffith Hugh Jones.