With one more conspiracy, this time of a domestic character, the tale of treason is ended. In the year 792 (the year in which Charles had an Avar war and a Saxon rebellion on his hands at once, and made his abortive attempt to join the Danube and the Rhine by a canal),[45] there was added to all his other cares a rebellion headed by one of his own flesh and blood. His eldest son Pippin was apparently not born in wedlock, though his mother Himiltrud, after her son’s birth, probably became Charles’s lawfully wedded wife. This defect of legitimacy would not have been an insuperable bar to succession in a house which derived its chief glories from the illegitimate Charles Martel; but there was another and more fatal circumstance in the case of Charles’s firstborn. Though beautiful in face he was deformed, probably dwarfish in figure, an unsuitable person therefore to be presented to the assembled Frankish warriors as heir to his father’s kingdom. Thus Pippin, though to a certain extent maintaining his princely rank, and named next to his father in the litanies of the Church, seems to have been silently edged out from all hope of succeeding to any portion of that father’s power. Charles, the eldest son of Hildegard, was apparently recognized as principal heir. Carloman and Louis were taken to Rome in their infancy and anointed Kings of Italy and Aquitaine, while Pippin was left unnoticed. Perhaps even the imposition of the ancestral name of Pippin on the child Carloman was meant as a hint to his elder namesake that he would never be saluted as Pippin, King of the Franks.
This exclusion doubtless galled the firstborn; and to these wrongs of his, real or imaginary, appear to have been added some inflicted on him and on his friends and followers by the unloved Fastrada. Thus, while most of the other chroniclers can see in the conspiracy of Pippin only the unholy attempt of a bastard, like another Abimelech, to seize the royal power at the cost of the lives of all his legitimate brethren, the honest Einhard in the following passage of his annals puts a different color on the enterprise.
“When the king was spending his summer at Ratisbon, a conspiracy was made against him by his eldest son, named Pippin, and certain Franks who declared that they could not bear the cruelty of the queen Fastrada, and therefore conspired for the death of the king. And when this was detected by means of Fardulf the Lombard, he, to reward him for his loyalty, was presented with the monastery of St. Dionysius [St. Denis], but the authors of the conspiracy, as being guilty of treason, were partly slain by the sword and partly hung from gallows, and so with their lives paid forfeit for the meditation of such a crime.”[46]