In 1870 Morgan took on a job as a writer on the Western Mail, and around the same period he began to write his own books after taking an interest in local history.

[1] In 1893 he wrote his magnum opus The Light of Britannia which again explored Druidism in Britain, but also included chapters on phallic worship, King Arthur and his twelve knights and Saint Paul's supposed journey to South Wales.

Paul R. Davis in his 1989 publication Historic Rhondda, goes further, blaming the book for misleading future historians, giving one example concerning Ynysgrug, a motte and bailey castle once located in Tonypandy: Morgan not only misidentifies the height of the 30 ft. mound as 100 ft. but states that "...all these sacred mounds were reared in this country...when Druidism was the established religion", but gives no historic proof.

[4] Despite Morgan's spurious research into Welsh history, this final book has become worthy of some note due to its account of 19th century life in the industrial valleys, the time from which he was writing.

[1] Despite working for the Western Mail, some of Morgan's more outlandish behaviour or claims were often challenged in the newspaper, and he was several times the subject of the daily cartoon, drawn by J.M.