This work investigates the life and political significance of Owain Glyndŵr, the last native Welshman to hold the title of Prince of Wales. Glanmor Williams, a distinguished historian of Welsh history, utilizes primary source documentation and contemporary chronicles to reconstruct the complex motivations behind the Welsh revolt against English rule. The book argues that Glyndŵr was not merely a rebel, but a sophisticated political leader who sought to establish an independent Welsh state with its own ecclesiastical and educational infrastructure.

Historians regard this text as a definitive academic account of the period, noting its rigorous adherence to archival evidence. Scholars frequently cite the work for its balanced perspective on the complexities of medieval Welsh governance and the challenges of historical interpretation.