By the second quarter of the fourteenth century, England had developed many attributes of a ‘constitutional monarchy’: one that would later expand and contract, in cycles, across the British Isles. This constitutional monarchy has been subject to many minor recalibrations; more major recalibrations have occurred between 1640 and 1690, and also between 1820 and 1870. To focus on the function and form of this hereditary institution of governance, it can be seen operating in accordance to rules and conventions within three separate if overlapping spheres: that is, the parliamentary, the personal and conciliar, and the judicial.