A history of religion in Wales between 1588, when the first complete Welsh Bible was published, and 1760. The book describes the development of Christian thought and how biblical religion evolved in response to social and political change.

'Without doubt this book by D. Densil Morgan aptly fills a gap in the historiography of Welsh religion and theology. It may, as the endorsement on the cover claims, address the fact that Welsh theology is ‘almost unknown outside Wales’; but more certainly it brings into one place a summary of the central ideas of Protestant writers, down to the mid-eighteenth century, which together embody a canon of influential Welsh thinking on religion. The author’s method is to provide biographical sketches of his subjects and then summarise the essence of their writings, so that the book is a valuable survey for anyone wishing to discover the principal ideas of a given Protestant author, preacher or polemicist during the period under review.' - Stephen K. Roberts, The English Historical Review, Volume 135, Issue 575, August 2020, Pages 1028–1030