A phase of work in the production of a manuscript. Large projects like costly manuscripts were often created in more than one campaign. For example, the boarder painting and the decorated initials were often created separately from the miniatures, which would be saved until last and completed in a later campaign by a master who specialized in that area of illumination. Additionally, a manuscript might be left unfinished due to the death of an illuminator, and later completed by another workshop, which would also constitute separate “campaigns” of work.