Parliamentary history refers to the study and documentation of the development and functioning of parliamentary systems over time. It examines how legislative bodies, such as the British Parliament or U.S. Congress, have evolved, including changes in structure, procedures, and political dynamics. This history helps to understand the role of parliaments in governance and their impact on society. Key events, such as the Magna Carta or the English Civil War, have significantly influenced parliamentary history by shaping the balance of power between the monarchy and elected representatives. Scholars analyze these events to trace the evolution of democratic principles and the establishment of modern legislative practices.