This book, a revised and extended version of Professor Davies's 1988 Wiles Lectures, explores the ways in which the kings and aristocracy of England sought to extend their domination over Ireland, Scotland and Wales in the twelfth and thirteenth centuries. It analyses the mentalities of domination and subjection - how the English explained and justified their pretensions and how native rulers and societies in Ireland and Wales responded to the challenge. It also explains how the English monarchy came to claim and exercise a measure of 'imperial' control over the whole of the British Isles by the end of the thirteenth century, converting a loose domination into sustained political and governmental control. This is a study of the story of the Anglo-Norman and English domination of the British Isles in the round. Hitherto historians have tended to concentrate on the story in each country - Ireland, Scotland and Wales - individually. This book looks at the issue comparatively, in order to highlight the comparisons and contrasts in the strategies of domination and in the responses of native societies.