Simon was sent to the guillotine with Robespierre in 1794, and two years later Marie Jeanne entered a hospital for incurables in the rue de Sevres, where she constantly affirmed the dauphin's escape.
Robespierre visited Marie Therese on the 11th of May, but no one, according to the legend, entered the dauphin's room for six months until Barras visited the prison after the 9th Thermidor (July 2 7, 1794).
Immediately on the announcement of the dauphin's death there arose a rumour that he had escaped.
According to him Barras determined to save the dauphin in order to please Josephine Beauharnais, the future empress, having conceived the idea of using the dauphin's existence as a means of dominating the comte de Provence in the event of a restoration.
The official version of the dauphin's history as accepted under the Restoration was drawn up by Simien Despreaux in his uncritical Louis XVII.
He was much employed, owing to Richelieu's influence, in the fetes of the dauphin's marriage, and was rewarded through the influence of Madame de Pompadour on New Year's Day 1745 by the appointment to the post of historiographer-royal, once jointly held by Racine and Boileau.
On the ground that peace was not sufficiently assured by the Pouilly meeting, a fresh interview was proposed by the dauphin and took place on the 10th of September 1419 on the bridge of Montereau, when the duke of Burgundy was felled with an axe by Tanneguy du Chastel, one of the dauphin's companions, and done to death by the other members of the dauphin's escort.
Was at that time supreme, formed the centre of a powerful anti-Choiseul cabal, which succeeded in less than a year after the dauphin's marriage in bringing about the fall of Choiseul and seriously threatening the stability of the Austrian alliance.
Thus the young princess was surrounded by enemies both at court and in the dauphin's household, and came to rely almost entirely upon the Austrian ambassador, the comte de Mercy-Argenteau, whom Maria Theresa had instructed to act as her mentor, at the same time arranging that she herself should be kept informed of all that concerned her daughter, so that she might at once advise her and safeguard the alliance.
The intrigues of the French parties culminated in the assassination of John of Burgundy by the dauphin's partisans at Montereau (September io, 1419).