 This hypothesis, according to which the prisoner is thought to be Louis XIV's elder brother, is not based on any proof, on the other hand Pagnol does not put forward any information that would demonstrate it is wrong.French journalist Elie Fréron published letters in the periodic l’Année littéraire in 1768.Letter from Lagrange-Chancel, imprisoned on the islands of Sainte-Marguerite from 1719 to 1722

Lagrange-Chancel reports the account of Mr de Lamotte-Guérin's, governor of the Islands at the time of Lagrange-Chancel's imprisonment and lieutenant of the islands, therefore Saint-Mars's deputy, at least six years before the Prisoner's transfer to the Bastille.