Chapter 3 explains how various early modern English governments and authors extended the medieval discourse of sovereignty to support claims to jurisdictional superiority and expansive unions. It begins with an overview of governmental claims, especially in relation to Scotland, and then assesses their impact on political writing through John Dee’s Brytanici Imperii Limites and Robert Persons’s A Conference About the Next Succession to the Crowne of Ingland. The chapter subsequently examines historiographical and literary texts that echo or interrogate sovereignty discourse, using William Harrison’s Description of Britain and Edmund Spenser’s epic romance The Faerie Queene as examples. Harrison’s history reiterates governmental claims and dismisses any possibility of equal union with other polities. Spenser’s Faerie Queene also generally endorses English empire. Only his Two Cantos of Mutabilitie expose the discourse’s shortcomings and gesture, however tentatively, toward the possibility of a politics not shaped by competing narratives of conflict.