The House of Lords served as the highest court in the UK for over 130 years. In 2009 the new UK Supreme Court took over its judicial functions, closing the doors on one of the most influential legal institutions in the world, and a major chapter in the history of the UK legal system. This volume gathers over 40 leading scholars and practitioners from the UK and beyond to provide a comprehensive history of the House of Lords as a judicial institution, charting its role, working practices, reputation and impact on the law and UK legal system. The book examines the origins of the House's judicial work; the different phases in the court's history; the international reputation and influence of the House in the legal profession; the domestic perception of the House outside the law; and the impact of the House on the UK legal tradition and substantive law. The book offers an invaluable overview of the Judicial House of Lords and a major historical record for the UK legal system now that it has passed into the next chapter in its history.