This introduction suggests that political practices, discourses, and events in fifteenth-century England were shaped by the experiences of those who governed, lived in, and travelled through towns. The tradition, however, of studying individual English towns, rather than assessing the collective influence of multiple towns, has made it difficult for the role of townspeople and urban spaces in English political life to be appreciated. Here, a new methodology is proposed for studying relationships between towns and for tracing the relative strength of this inter-connected ‘urban sector’ at particular points in time. Fluctuations in the membership and strength of this ‘urban sector’ had significant implications for how pivotal events in English history—including the Wars of the Roses—played out.