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Renormalisation group (RG) methods are one of the theoretical masterpieces of postwar physics whose historical development still remains largely unexplored. This article traces the origins of Kenneth Wilson’s RG from 1956 to 1965, with a particular focus on its relationship to Murray Gell-Mann and Francis Low’s RG published in 1954. I argue that there is ultimately little methodological and conceptual continuity between their respective versions. The article briefly concludes with the evolution of the Wilsonian RG from 1965 to the early 1970s.