The sixty-seventh tale of the Heptaméron is often described as the most reliable documentary source for the core facts of Marguerite de la Rocque’s ordeal.

It is not a verbatim account — it is shaped by the literary conventions of the tale-telling genre in which it appears, and some details may have been altered or embellished.

But the queen of Navarre was writing for a court audience that included people who might have known the real story, and her account appears to be based on what Marguerite herself told someone — possibly the queen directly.

The tale in the Heptaméron is relatively brief — a few pages — and it focuses primarily on the emotional and spiritual dimensions of the story rather than on practical survival details.