Robert Graves
Graves admitted his argument depended on tree letter-names in O'Flaherty's Ogygia (1685), which the ogham scholar Macalister called 'late artificialities'.
Robert Graves, The White Goddess, ch. 7 'Gwion's Riddle Solved' (text read in the amended 1961 edition, with Postscript 1960), on O'Flaherty's Ogygia and Macalister's letter
English poet and novelist (1895-1985), author of The White Goddess (1948).