A recent collection of essays on Edward I's castles in north Wales features contributions on Edwardian building-campaigns in Scotland and Gascony but not Ireland. This paper, which begins with some brief comments on that collection, offers some thoughts on Ireland's place in Edward's world. It considers how his wars in Wales, Scotland and Gascony might have impacted on the Irish landscape, and it suggests that origins for, or at least earlier versions of, some of the architectural and town-plan schemes deployed in Gwynnedd in the Edwardian era might be sought in Ireland.