The series comprises letters, 1880-1920, addressed to O. M. Edwards, from his first arrival at the University College of Wales, Aberystwyth, until the time of his death. Many of the letters are from prominent Welsh public figures. The early letters relate to Edwards's career as a student at the UCW, Aberystwyth, the University of Glasgow and Balliol College, Oxford. Some concern his preaching engagements, his plans and ambitions, while others give local news from the Llanuwchllyn area. Following his appointment as Fellow of Lincoln College, Oxford, in 1889, many of the letters concern his academic work and university responsibilities, and there are numerous requests for references and testimonials from students and former students. Some correspondents write in relation to educational matters in Wales, notably the passage and operation of the Welsh Intermediate Education Act, 1889, and the affairs of the University of Wales. -- From the 1890s onwards many letters concern O. M. Edwards's editing of Cymru and Cymru'r Plant, and later Wales, Heddyw and Y Llenor. Intermingled with these letters are some which refer to personal events in Edwards's life: his marriage in 1891, the death of his father in 1895, and the death of the eldest son Owen ab Owen in 1897. In 1899 many letters concern the death of Thomas Edward Ellis MP, the selection of Edwards as his successor as Liberal MP for Merionethshire, and his brief sojourn in the House of Commons until July 1900. -- Throughout these years the letters abound with references to educational matters, notably within the Universities of Wales and Oxford. Others relate to Welsh literary and cultural matters, the publication of Cyfres y Fil and the organization of Urdd y Delyn. A few letters concern Edwards's researches, writings and academic publications. -- From 1907 onwards many of the letters relate to O. M. Edwards's duties as Chief Inspector of Schools in Wales. Throughout the remaining years there are numerous communications from Edwards's former students at Oxford, invitations to deliver lectures and attend various functions and events, and letters relating to the editing of journals, notably Cymru and Cymru'r Plant. Others concern literary, cultural and publishing matters, and many relate to educational themes. These are interspersed with congratulatory messages on receipt of the Medal of the Honourable Society of Cymmrodorion in 1915 and a knighthood in January 1916. Many of the letters from the final years refer to O. M. Edwards's personal, health and family problems.