The concepts of "tradition" and "authority" are generally understood to be problematical in history curriculum design. Drawing on MacIntyre's account of disciplines as social practices, this article argues that, to the contrary, these are concepts that need to be incorporated into any curriculum theory that attempts to build a school subject on the foundations provided by an academic discipline. In history education, there is a strong consensus towards deriving the ideas of the history curriculum from the discipline of history, and this article argues that it is therefore necessary for history curriculum theory to account for the concepts of "tradition" and "authority" as they exist in disciplinary practice.