This thesis examines perceptions of the Irish in medieval English writing from 1200-1400 AD. Chapter 1 will analyze how Ireland was portrayed in the imagined geography of the Middle Ages, including in classical sources, maps, and as an "otherworld." Chapter 2 focuses on how English writers used origin myths, biblical references, and pseudohistory to assert England's right to rule Ireland. Chapter 3 evaluates how stereotypes of the Irish changed over time with growing English nationalism, ecclesiastical power struggles, warfare, and a royal visit to Ireland in 1399. The author argues perceptions of the Irish were important to shape English national identity and influence how the Irish were governed. Primary sources include chronicles, statutes, literature, and religious writings.