Книга истории франков
Ian Wood recommends focusing only on the four earliest sources for this information, as later sources are based on these few documents. He starts with the continuations of the chronicles of Fredegar, which do not mention this connection, and are based on an earlier work. He says that "since Childebrand himself was the half-brother of Charles Martel, it is not surprising that the Fredegar continuator add the information contained in the Liber Historiae Francorum material largely concerned with Austrasia and Frisia" in 751. However, he adds no information regarding Arnulf at this time. The Liber is one of the earliest works detailing the history of this period and makes no mention of the relationship between Arnulf and Ansegisel.