Bénac, Les Saints d’Auch, pp. 90-91, 95. The former churches of Préneron and Saint-Go had the saint as their patron. Bénac also mentions the former parishes of Saint-Fris Castets (South of Aignan) and Thézan (near Lagraulet-du-Gers).
Ian Wood, 'Franks and Frisians'. in: John Hines and Nelleke IJssennagger-van der Pluijm (eds.), Frisians of the Early Middle Ages, Woodbridge, NJ 2021, pp. 203-222, p. 211.
The names of Radbod's sons are not mentioned in contemporary sources. 16th-century historiography invented three baptized sons of Radbod: Melcher (the son who died after baptism), Adelgil the Second and Poppo. Only the last one is historical. It is quite possible that the clerics of Bassoues and Auch got acquainted with these ideas. Cf. Ludovico Guicciardini, Description de touts les Pays-Bas, autrement appellez la Germanie Inférieure ou Basse Allemagne, Amsterdam 1609, p. 223.