After crushing the Protestants and thwarted Leto, Louis feels invincible. But his family and France are divided. What to expect from the future? What will be his legacy? Louis summons the Dauphin to show him how to be a good king. Louis decides to go to Paris to bless the sick. He does not know that the rebels fomented an attack for the murder...
Fabien knows Louis has killed the prisoner and deduces the truth about the Man in the Iron Mask. Philippe decides to leave the court. Leto convinces Maintenon to support the marriage of Louis and the Infanta Isabella. But against all odds, Louis marries Maintenon and proclaims himself head of the Church of France. Louis accelerates his campaign of expansion in Europe and persecutes the Protestants.
While Philippe wants to send the man with the iron mask to the colonies, Louis knows that it must be eliminated. Meanwhile, the revolt rages in the streets of Paris, and the loyalty of Fabien is put to the test in the face of the violence of the King. Leto takes advantage of Louis' weakness and the threat of excommunication.
Maintenon returns to the palace and encourages Louis to put his plans into action. Louis wants to discredit Leopold, and makes a secret pact with Barek, the Ottoman emissary. Philippe understands that the Church is at the origin of the conspiracy of the man in the iron mask, and suspects Louis to take part. Marie-Thérèse falls seriously ill.
Louis has Marie-Therese confined to the castle, suspecting her of conspiring against him with Leopold. Louis raises indignation by imprisoning a prominent Protestant philosopher. In Paris, Fabien is released in exchange for prisoners, but Louis asserts his authority by having one of them executed as an example.
Louis and Leopold compete for control of Spain, and Maria Theresa plays a dangerous game by supporting her lover rather than her husband. Philippe continues his investigation on the man with the iron mask. In the salon, the position of Maintenon, the king's pious favorite, is threatened. In Paris, the people refuse to pay taxes.