This series of five volumes - a pentalogy - is an account, exploration, defence, and a refining of the classical 'idea' of Christendom. The author defines Christendom as being: 'The religious and secular body of Christians of the world subscribing to the shared values and ethics inspired by Jesus Christ.' Volume One: On History, is an account of the evolution of the political and social 'Idea' of Christendom.