Bronson was about Charles Salvador.
In the form Charles, the initial spelling ch- corresponds to the palatalization of the Latin group ca- to [ta] in Central Old French (Francien) and the final -s to the former subjective case (cas sujet) of masculine names in Old French like in Giles or James (< Latin -us, see Spanish/ Portuguese Carlos)
Charles Martel (686741) was an illegitimate son of Pepin of Herstal, and therefore indeed a "free man", but not of noble rank

