This book addresses a conundrum. Alone of the major competing political interests during the civil wars of the 1640s, royalism needed to transcend attachment to one nation or one religious tradition and recruit a support base in each of England, Ireland and Scotland. This book aims to provide a concise interpretation and reassessment of royalism during these crucial years and focuses on this dilemma, and on the resources, intellectual and practical, deployed to address it, with mixed success. It focuses on the key ideas and values which made royalism a formidable political alternative, rather than on the more usual factional, military or literary perspectives. It argues that a ‘three-kingdom’ perspective not only gives a broader view but also clarifies the distinctive characteristics of English royalism, more robust than its counterparts in the other nations.