Edition of the erased marginal note of the first page of the manuscript of the Chanson de la croisade albigeoise (BnF fr. 25425). This note seems to indicate the name of the person responsible for the text as a whole, who is very likely the same as the – hitherto anonymous – author of the second part of the Chanson. It was probably added in order to correct the information given by the first lines of the text in this manuscript.