The letter written by Archbishop Manasses I of Reims (c. 1069–1080) to papal legate Hugh of Die in early 1080, first published by Jean Mabillon in 1687 and traditionally known as the Apologia, offers a vigorous defense of archiepiscopal prerogative against legatine authority during the pontificate of Gregory VII. Long thought to be the original letter sent to Hugh, the Mabillon text is, in fact, a later, expanded recension of the archbishop’s letter created to support resistance to Gregory VII’s reform agenda. The original, shorter version of Manasses’s letter survives uniquely in a little-studied, sixteenth-century copy at Wolfenbüttel. The expanded recension was likely compiled as part of a legal dossier assembled to defend ecclesiastical traditions and clerical privileges, including marriage, in the church province of Reims. Through a textual analysis and comparison of the versions of Manasses’s letter, what once was seen as a singular protest emerges as a strategic text within a broader regional pushback against Rome and reveals how local clerical networks harnessed legal tools to challenge papal reform. The history of the letter’s preservation and reproduction, from Mabillon to modern editors, in turn demonstrates the necessity of querying the manuscript and printed evidence of sources from the eleventh-century reform period to better understand how they were deployed and how modern editorial choices have shaped our reception, and hence our assumptions, about the texts.