The research on William Williams, Pantycelyn seeks to integrate his life and his work within the context of the Welsh Reformation and on the wider Protestant world. While it is not original research, per se, it is original in the sense that this research seeks to shine a light on William Williams, Pantycelyn from a viewpoint within twenty-first century United States. The research first seeks to understand the cultural and religious landscape of eighteenth century Wales before looking at Williams’s life and particularly his most famous work Arglwydd, arwain trwy’r anialwch (in English, Guide Me, O Thou Great Jehovah/Redeemer)