Versailles

In 1667, a young Louis XIV seeks to consolidate his authority in France, driven by the trauma of the Fronde, a noble-led revolt during his father's reign. Determined to centralize power away from Paris, he chooses to transform the modest hunting lodge of Versailles into a grand royal residence.

The birth of the first royal child sparks rumors at court, while Louis XIV's advisors push for war to strengthen his authority. Meanwhile, his brother Philippe, eager for recognition, longs to take part in the military campaigns.

Louis XIV requires the nobility to reside at Versailles, but they must prove their noble lineage to gain entry. Montcourt, unable to verify his noble status, seeks help from the enigmatic Duke Cassel. Meanwhile, the king asks the Queen to host Annaba, an African prince.

Cassel's band of killers continues to attack visitors at Versailles, including the king's goddaughter, prompting Fabien to suspect their true identity and attempt to trap them by arresting a suspect. Meanwhile, Philippe earns recognition as a hero for his role in the siege of Cambrai, and Louis sends his brother's lover, the Chevalier, to join him, after the Chevalier has manipulated the king's mistresses. Louis visits Philippe before an upcoming battle and acknowledges his brother's superior military skills.

Philippe returns to Versailles as a celebrated war hero, eager to assert himself against his brother as a peace treaty with Spain is signed. As Louis prepares a grand celebration, concerns about ongoing highway attacks lead Fabien to suspect Cassel, who refuses to attend. Athenais de Montespan, with Sophie de Clermont in tow, is sent to pressure Cassel into compliance, using Sophie as an unwitting lure. The festivities trigger painful memories for Philippe, Sophie makes a reckless choice that disappoints her mother, and Cassel is left defeated as he returns to his ruined estate.

Ex-soldiers working on palace construction go on strike, feeling mistreated, and their protest prompts discussions about mediation. Despite advice from Jacques, Louis refuses to accept Philippe's help, driven by jealousy. Meanwhile, Louis's harsh behavior extends to keeping Louise de la Vallière at court and ignoring the schemes of Athenais and Cassel. He eventually enlists Philippe to end the strike, after which Philippe begins making plans to leave Versailles.

Louis falls seriously ill, and while it is claimed to be the result of a hunting accident, rumors swirl at court, especially after Philippe reveals to Rohan that he would become regent if Louis dies. As Louis's condition worsens and he wanders the palace in a delirious state, the queen and others begin making contingency plans, though Louis eventually recovers thanks to Claudine Masson, who becomes his physician. Fabien's spy network uncovers a conspiracy led by the Chevalier, leading to arrests, and Mademoiselle de Clermont is finally allowed to become a nun.

Philippe, burdened by personal turmoil, faces political challenges as Louis seeks an alliance with England to invade the Netherlands, sending Henriette to London to negotiate with her brother Charles II. A conspiracy to assassinate her is revealed by Montcalm, while Fabien narrowly escapes an attack and Philippe is offered a new role by Louis.

Louis hopes to strengthen diplomatic ties when his queen, Henriette, negotiates an alliance with England against the Dutch, securing financial support and a guard for King Charles II. However, tensions arise when William of Orange questions the Stuart family's reunion, and Charles offers him a princess's hand in marriage. Meanwhile, Marchal struggles to dismantle a secret society linked to Orange, successfully exposing and eliminating a fraudulent group, while the court continues to navigate shifting political and personal dynamics under Louis's centralizing influence.

Duchess Henriette falls suddenly ill upon returning from a visit to her brother in England, leading to suspicions of poisoning. As a precaution, King Louis XIV orders the closure of all access to Versailles.

Louis continues to enjoy the growing success and global acclaim of his palace, but he remains troubled by recurring nightmares.

Concern over the nobility's moral decline focuses on the King's bed, with rumors of love potions and powders circulating. Philippe prepares to meet his new wife, while Marchal investigates another poisoning case.

Princess Palatine experiences a chilly reception both socially and in her marriage, while Sophie faces a far more perilous fate. Meanwhile, Marchal identifies a potential culprit in the poisoning cases.

Madeleine de Foix is arrested for attempted murder after trying to poison Fabien, while the Montespan child falls seriously ill. Louis XIV faces disapproval from Bossuet and Pascal, and Sophie suffers a harrowing ordeal in her marriage to Cassel.

King Louis XIV's worsening insomnia leads to erratic behavior, rendering Marchal's loyalty ineffective. Claudine persists in her investigation of a mysterious toxin, while Sophie works to resolve her personal predicament.

A foreign delegation refuses to negotiate with the queen, prompting Philippe to assume royal duties in her absence. Meanwhile, Fabien grapples with grief and a desire for revenge after Claudine's death, and the king's mistress allows her jealousy to spiral out of control.

Louis engages in an intense duel with Guillaume d'Orange, leaving him invigorated upon his return to Versailles. Meanwhile, the court is shaken by two unexpected deaths, and Montespan grows more withdrawn as she feels her influence wane.

Louis ends his affair with Madame de Montespan, who, in response, seeks help from sinister sources. Meanwhile, Palatine falls ill under suspicion of poisoning, and Cassel exposes Thomas's hidden schemes to the king.

Louis enlists Phillipe to draw near to a suspected spy, which stirs the Chevalier's jealousy. Meanwhile, Fabien discovers the true fate of the children rescued by Father Etienne. Montespan, determined to win back the king's favor, faces competition as Louis becomes intrigued by a more devout woman.

The investigation into the widespread use of poison in Paris raises concerns that the scandal may involve members of King Louis XIV's inner circle, prompting authorities to probe the royal court.

Louis hosts Leopold, the deposed Holy Roman Emperor, at Versailles, while Philip, having won the war, is entrusted with choosing prisoners for deportation to the colonies. A suspicious, masked prisoner stirs Philip's doubts.

Louis and Leopold vie for dominance over Spain, while Maria Theresa navigates political risks by backing her lover over her husband. Philippe pursues leads in his inquiry about the man with the iron mask, and Maintenon's influence at court comes under threat. Meanwhile, tax resistance emerges among the people of Paris.

Fabien struggles to keep control in Paris as unrest grows. At court, revelations about Louis's past strain his relationship with Maintenon. Meanwhile, Philippe is attacked after encountering the man with the iron mask, and at the Vatican, Cardinal Leto considers substituting himself for the French king.

Louis imprisons Marie-Therese in the castle, believing she is working with Leopold against him, while also sparking controversy by jailing a notable Protestant thinker. Meanwhile, Fabien is freed in a prisoner exchange, but Louis demonstrates his power by ordering the execution of one of the exchanged prisoners as a warning.

Maintenon returns to court and urges Louis to proceed with his political strategies. Seeking to undermine Leopold, Louis enters into a clandestine agreement with Barek, an emissary from the Ottoman Empire. Meanwhile, Philippe begins to suspect Louis's involvement in a conspiracy linked to the Man in the Iron Mask, tracing it back to the Church, and Marie-Thérèse becomes seriously ill.

Louis shifts his strategy to counter Leopold's moves, only to face an unexpected challenge in Cardinal Leto, who arrives at the Queen's funeral. At the same time, Philippe uncovers a shocking revelation about the man behind the iron mask.

Leto decides to transport the enigmatic man in the iron mask to Versailles, prompting Bontemps to take action due to concerns over potential risks. With Fabien's assistance, Bontemps secretly moves the prisoner and presents him to Louis and Philippe, leading to the eventual revelation of his identity.

Philippe seeks to exile the man with the iron mask to the colonies, but Louis is determined to have him eliminated. As riots erupt in Paris, Fabien's loyalty is challenged by the King's violent response to the unrest. Leto exploits Louis's vulnerability and the looming threat of excommunication.

Fabien uncovers Louis's role in the prisoner's death and the secret of the Man in the Iron Mask, prompting Philippe to abandon court life. Leto persuades Maintenon to back Louis's marriage to the Infanta, but Louis ultimately marries Maintenon and declares himself head of the Church of France, intensifying his European expansion and persecution of Protestants.

Louis, feeling triumphant after suppressing the Protestants and defeating Leto, grapples with the growing divisions within his family and France. He mentors the Dauphin on kingship and plans a journey to Paris to bless the sick, unaware that rebels are plotting an attack against him.