Sigebert IV (c. 671 - c. 679) was the son of Dagobert II and a Saxon duchess called Mathildis (also called Mechthilde) ...
... According to the pseudohistorical Dossiers Secrets d'Henri Lobineau and related documents, Sigebert IV, on the assassination of his father Dagobert II, was rescued by his sister and smuggled to the domain of his mother the (otherwise unknown) Visigoth princess, Giselle de Razès ... [BUT] Journalists and scholars who have debunked the Priory of Sion hoax argue that Pierre Plantard created the Dossiers Secrets d'Henri Lobineau and the fictitious biography of Sigebert IV to support his false claim that he was a descendant of the extinct Merovingian dynasty through this figure. ...
