This essay explores the implications of historicising John Rawls’s theory of justice. While historical research on Rawls and his social context has provided valuable insights, some scholars argue that historicising carries significant philosophical consequences. This paper critically examines one such argument that contends that historicising Rawls’s theory demonstrates its contextual nature, undermines its diagnostic powers, and leads to its complete dissolution. We offer a reconstruction of this argument and show that it fails. Further, while we argue that this argument fails, (...) we go on to suggest that historical evidence may contribute to a defensive argument against appeals to expert opinion. By examining the appropriate relationship between historical research and philosophy, this essay contributes to the evaluation of the historicist critique and offers insights into the broader role of historical research in philosophical discourse. (shrink)