This is explained by Einhard's subsequent account of Pepin's revolt. Pepin feigned illness as he plotted with "certain leading Franks" to overthrow his father. When the plot was discovered, Einhard writes that Pepin was tonsured and sent directly to the monastery of Prüm. In his paper "Pipinus Rex" historian Carl Hammer points out the disparate attention Einhard gives to Pepin's revolt, arguing, "he gives it priority over his account of the evidently more widespread and possibly more dangerous rebellion of 785/6." Hammer also points out that Einhard describes Pepin as a "hapless pawn of the real conspirators" and so hopes to maintain the cohesion of the family unit in his portrayal of Charlemagne and his offspring. Finally, Hammer points out that no historian we have record of prior to Einhard called Pepin "the Hunchback"—Presumably, this slander was another aspect of Einhard's attempt to spare the family."