First, in the seventeenth century, came the secularisation of knowledge in the form of science and philosophy. Then in the eighteenth century came the secularisation of power by way of the American and French Revolutions and the separation - radical in France, less doctrinaire in the United States - of church and state. In the nineteenth century came the secularisation of culture as art galleries and museums were seen as alternatives to churches as places in which to encounter the sublime. Finally in the 1960s came the secularisation of morality, by the adoption of a principle first propounded by John Stuart Mill a century earlier - namely that the only ground on which anyone, including the state, is justified in intervening in behaviour done in private is the prevention of harm to others. This was the beginning of the end of traditional codes of ethics, to be replaced by the unfettered sanctity of the individual, autonomy, rights and choice.