This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book explores communities in early medieval Britain like the territory of the Dunsaete that were part of a broader region where Anglo-Saxons and Welsh lived in close proximity for hundreds of years. It describes how the Welsh borderlands before 1066 were depicted in literary and historical texts from early medieval Britain. The book argues that the Anglo-Saxon Chronicle represents the military culture of the Welsh borderlands in a distinctive way which aligns its inhabitants with outlaws. It articulates a discernible culture in the Welsh borderlands prior to 1066, revealing a new facet of the Norman impact on England. The book suggests that some of the singular characteristics of the region that would later become the March of Wales began to take shape during the Anglo-Saxon period.