From the twelfth century to the seventeenth, political prophecy was prominent among English literary genres no less than in English political life. Derived from Welsh poetic tradition via Geoffrey of Monmouth’s Latin History of the Kings of Britain, prophecy reached all social classes. Prophetic texts influenced the decisions of kings, shaped public perception of regnal politics, and landed people in prison (or worse). Peripheral to the kingdom of England, eastern Wales and the Marches were central to the production and dissemination of political prophecy in Britain.