‘Howlett’s theories are, as usual, thought-provoking …’, Helen McKee & James McKee, Cambrian Medieval Celtic Studies.
‘As an overall study of the inscriptions … this book is to be welcomed … he covers Ireland, Wales, Scotland, as well as England and covers these areas over more or less the whole of the medieval period … This book is broad in yet another way in the range of languages that it covers', Thomas O’Loughlin, Early Medieval Europe.