 The republication of Berlin’s numerous essays in thematic collections, beginning with Four Essays on Liberty (1969) and Vico and Herder (1976), and continuing at an increased pace from 1978 under the general (and mostly specific) editorship of Henry Hardy, served to highlight as a central dimension of Berlin’s thought his advocacy of the doctrine of value pluralism (which he himself called ‘pluralism’). Increasingly from the early 1990s value pluralism has come to be seen by many as Berlin’s ‘master idea’, and has become the most discussed, most admired and most controversial of his ideas.