Modern accounts of the battle of Brunanburh have generally suggested a location in the Northumbrian-Mercian borderlands east or west of the Pennines, a conclusion based in part on analysis of the aims and strategy of Anlaf Guthfrithson, Viking king of Dublin. This article re-examines the political dynamics of the coalition against Athelstan, taking account of the territorial and political ambitions of the kings of Alba and Strathclyde, and proposes a radically different interpretation of the campaign of 937. It also questions the reliability of the variant form Brunanburh as a guide to the battle's location and concludes that the most likely site was Burnswark in Annandale.