 Since the 1990s, pluralism has become the most widely and hotly debated of Berlin’s ideas. This is due in part to Berlin’s work, and in part to that of later philosophers who, as followers or allies of Berlin or independently, have also articulated and advanced value pluralism or similar  positions.[18]  Although pluralism achieved its current prominence in interpretations of Berlin’s work later in his life, it was identified earlier as a key component in his thought by a few prescient readers. Two of these readers advanced what remains one of the most common criticisms of Berlin’s pluralism: that it is indistinguishable from relativism (Strauss 1961; Momigliano 1976; see MacCallum 1967a and Kocis 1989 for other early  critiques).[19]