This work investigates the socio-political, religious, and cultural transformation of Wales during the two centuries following the collapse of the Glyndwr rebellion. Glanmor Williams, a distinguished historian of Welsh history, utilizes a synthesis of archival records, administrative documents, and contemporary literary sources to construct a detailed analysis of the Welsh experience. The book argues that this period was not merely one of decline, but a complex era of adaptation, reformation, and the emergence of a distinct national identity within the broader British context.

Historians and scholars of Welsh studies regard this volume as a foundational text for understanding the transition of Wales into the early modern period. Readers frequently note the academic density of the prose and the author's meticulous use of literary sources to illuminate social history.