R. Tudur Jones's history of Welsh Congregationalism, which has long been recognized as the standard and authoritative work in this field, is made available to English readers in this translation. Written in an accessible style, this scholarly work describes a key aspect of Welsh and Welsh-English history, showing how Wales's religious history is intertwined with the emergence of a national identity. Over four centuries of religious and social history, events, characters, and thought are examined, focusing on ways in which the Congregationalist movement impacted and strengthened the literary traditions and political consciousness of the Welsh people.