About Théodéric IV, roi des Francs
Do not confuse him with Thierry I, comte d'Autun
Théodéric IV was King of the Franks (721-737), as a puppet of Charles Martel, the Mayor of the Palace. After his death, the throne was vacant for seven years, until Charles Martel appointed Childéric III to succeed him.
In some modern literature he is confused with Thierry I d'Autun (c720-793), who was father of Guilhem de Gellone. See, for example, Michael of Albany and Walid Amine Salhab, The Knights Templar of the Middle East (San Francisco, 2006), 52.