Sigebert IV de Franks

According to the pseudohistorical Dossiers Secrets d'Henri Lobineau and related documents, Sigebert IV was the son of the Merovingian king Dagobert II who, on the assassination of his father, was rescued by his sister and smuggled to the domain of his mother, the Visigoth princess Giselle de Razès in Rennes-le-Château. He is said to have arrived in the Languedoc in 681 and, at some point, adopted or inherited his uncle's titles, duke of Razès and count of Rhedae. He is also said to have adopted the surname, or nickname, of “Plant-Ard” from the French appellation ‘rejeton ardent’ ‘ardently flowering shoot’ of the Merovingian vine. Under this name, and under the titles acquired from his uncle, he is said to have perpetuated his lineage.