Unfortunately for Jarnac, Francis died within a year and Chataigneraie readdressed his request to the new Sovereign, Henri II.

“To the King my Sovereign Lord,
Having learned that Guichot Chabot, while at Compiegne during the reign of the late King, declared that whoever accused him of boasting of having misconducted himself with his stepmother was a malicious villain, I reply that he has wickedly lied, since he has boasted to me about it on several occasions.
Francois de Vivonne”

Some time later he amplified the challenger in a letter:

“Sire, - I very humbly entreat you to accord me a field for mortal combat, wherein I propose to prove by arms, upon the person foresaid Guichot Chabot what I have said and what I maintain in order that by my hands may be verified the offence which he has committed against God, his father and Justice
Francois de Vivonne”

Jarnac on finding out about the letter, wrote the King:

“To the King my Lord,
Sire, - I have come from my house expressly to defend myself, and I pray of you to believe in my honor. I say that Francois de Vivonne has lied in the construction, which he has given to what I said to you at Compiegne, and for that, Sire I entreat you very humbly to be pleased to sanction a combat to the death.
Guichot Chabot”

And he wrote to the Bishop of Beziers, who was in favor with Henri II asking for his intersession, saying in part:

“He intended to attest by his bravery the good substance he had received from the late King, his present Sovereign and to stop La Chataigneraie's lying mouth with his sword”

When the two letters were shown to Chataigneraie, he wrote:

“To the King my Sovereign Lord,
Sire, - You have been pleased to consider the difference between Guichot Chabot and myself, in relation to which I have read a letter bearing his signature, wherein he offers at once to enter the lists and bear arms so bravely that he will testify to the sustenance he has received from the late King and from you, boasting, moreover, that he will stop my mouth with his sword. And since, Sire, he shows a disposition to come to the point which I have always pursued, I beg you very humbly to grant me a field in your kingdom to settle our difference by mortal combat, or permission to meet elsewhere.
Francois de Vivonne”

Henri decided to go forward with the duel  and the council met in May and set the date for the fight to take place within 40 days. The final date agreed for the fight was Sunday, 11 June 1547, before Henri's coronation at Rhiems. Both combatants were warned that the penalty for defeat in the combat was death, unless the King took the loser then the loser could, as well as his descendants, lose his noble rank and his rights, eminences, privileges and prerogatives that nobles enjoyed. Both men agreed.

The King then sent a letter to Jarnac ,

“Guichot Chabot,
I am indicating to you the choice of the field which the King has been pleased to send to me, and on which I wish to prove to you through the offensive weapons you may choose - but let them be in keeping with a gentleman of honor.”

Then he asked for the list within four days of the Jarnac's choice. He drew up the list of arms and armor and sent it round by herald to be read to Chataigneraie.