Poet R. S. Thomas (1913-2000) is the most recognizable figure in twentieth-century Welsh literature, yet his oeuvre is often the subject of strong debate among critics and reviewers. Some believe him to be the greatest religious poet of his age, or simply the greatest poet, while others believe that his iconic reputation is disproportionate to the quality of his poetry. This book tests existing critical claims by analyzing the poetry directly and considering its intricacies of structure, form, register, shape, and movement.