2015 marks the 800th anniversary of the signing of Magna Carta, the influence of which is still felt today around the world. In 1215 the barons of England forced King John to sign a revolutionary document which would change the political landscape not only of thirteenth-century Britain, but of the modern world. Magna Carta was the forerunner of the constitution that limited the powers of the crown and its echoes can be found in the seventeenth-century Civil Wars, the struggles for American Independence, the work of Thomas Paine and in the bedrock constitutional legislation of just about every...