Readers of this chapter might be left with doubts whether England had a constitution in the fifteenth century and whether, if there was one, it underwent any significant change over the century. Difficulties in governing the realm, ambiguities about power and authority, and a fundamental lack of consensus about what constituted and who had a legitimate right to rule persisted from the opening years of the period through to its end. The only notable progress recounted here was in procedures and practices in parliament. This difficult century left England with a hunger for new assertions of power and authority in the succeeding one.1