Aeyron spars with Ser Edmund Moore when Ignis Swyft comes upon them interrupting their game, later that day Aeyron and Ulthor get in a small spat about the woman they love, Joanna, highly irritating Ulthor. In the throne room Aeyron and Ulthor's talk eventually breaks down into an argument between them over Joanna, Ulthor ends the talk threatening to crown Joanna if he would not. 

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Aeyron takes refuge in Joanna walking and taking with her in the peaceful Royal Gardens. The two of them engage in flirting as Aeyron remarks her beauty, Joanna becomes suddenly anxious were she reveals that she has decided to leave King's Landing to back to her home in order to prevent anything occurring between Aeyron and Ulthor, Aeyron wants to accompany her to WinterFort but she denies it saying she wants to calm everything down. Bringing Aeyron would incite Ulthor, she plans to leave in a months time.

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Aeyron with Ser Lewyn finds out about Samuel's attack on Nestor and Ulthor, venturing there, he agrees with Ulthor that he couldn't let it go without reprimand, on the fly he decides he will make a decision in 3 days time all the while the trio would be placed in arrest with Nestor and Ulthor away from Samuel. After the three days he is shocked to learn that Ulthor and Nestor have disappeared from their room, in an emergency small council meeting called by Grand Maester Varlyn they learn that Ulthor and Nestor(and their lands) have declared war with him. 

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Aeyron sends Edmund and Jon to Sun's Champion and GoldGift with Jon commanding an army. A few days into the war Aeyron learns that Joanna has gone missing and at first he thinks she might have left for the North early though her handmaidens don't know where she is. After a meeting with the Councillor of the King, Selyse, Taena Skies approaches Aeyron with a nightsister who reads his prophecy.

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At a council meeting Aeyron airs his intention to command the loyalist army joining with the Northern and Watermen host, on the day Aeyron and the host leave a riot occurs for food resulting in the king and the army leaving King's Landing in complete silence and anger. After the invasion of the Waterlands by the Bronzemen Aeyron sends Lord Harold Strong with 30,000 men to deal with it. 

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Due to an illness from the showers of rain Aeyron has a dream where he sees King's Landing changed for the better, with the slums being gone. He realises that his own private chambers have been changed beyond his recognition, in his wardrobe were clothes of women along with men and on his night table was a woman's crown. He see's the figure of Joanna greet him asking "where Trystane [was]". In disbelief and shock he replies "with my brother?, Joanna reveals it is their son she is talking about. he hugs the dream-figure of Joanna but feels her evaporate and disappear. He appears in another dream with the only recognisable thing to be Sun's Champion, he see's a green woman and a man with bronze skin-where a voice tells him it is his ancestor Marcon Archer. 

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When he wakes Ser Lewyn and Ser Hyle give him a letter sent from Alice Strong, the daughter of Lord Harold Strong, who was besieged at her home by the Bronzemen. During the Battle of King's Landing Aeyron, the Northerners and the Watermen come from the Lionsgate, breaking it down the cavalry charge with Aeyron, Lewyn and Hyle leading the charge. The loyalists defeat Nestor's rebels killing and capturing around 40 thousand while the rest escape.

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Aeyron hosts a celebratory feast for the victory the day after. Before the feast he menacingly sends away an angry Thoron Hull who attempted to get vengeance for Lewyn who stopped him killing Thoron's brother only to kill The Mountain himself. During the feast a pyromancer known as Lord Ahriman tells Aeyron the story of a dark pyromancer by the name of Darth Plagueis, the story chills his two sisters while Aeyron remains unbothered interested in the myth. Also in the feast is the reunion of Jon Darklyn brought by Soniya Cross who saved him after he was presumed dead.

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The Ghost of Blackfyre reveals a prophecy to Aeyron that she saw many years ago, a prophecy more ambiguous than the last one Aeyron had heard. In the final small council meeting Aeyron revealed his plan to end the war in a final battle knowing that thousands would lose their lives in an enormous battle. After learning from Taena that she knew where Joanna was but withheld the information he furiously extracts the information from her then he kicked out from the meeting, a couple hours the loyalist army left King's Landing to Goldgift.

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At the Battle of the Reach Aeyron leads the left flank to the bridge by the riverside. In the battle he kills Lord Arnon Violeta, Ser Arnold Violeta and Lord Mace Levanter. In the climax of the battle he seeks out Ulthor and finds him savagely bludgeoning Ulthor's face with his bare hands killing him. 

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Together with Lord Cregan Forrester and Ser Steffon Bracken the three of them go alone to WinterFort to rescue Joanna. At Widow's Wail they find that Lord Tywon Casterly has besieged the castle, after a heated confrontation with Ser Jaime Casterly Aeyron tells Tywon and his army to reroute to Knife's Edge and take that castle.

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When they leave the trio find Joanna in the Queentower, where she is dying. Joanna reveals to Aeyron that her and Ulthor were in love and secretly got married without any of Ulthor's men knowing. She shows her two twin children that were recently born and asks her father and Aeyron to promise that they keep the children safe, when he agrees to it Aeyron leaves Joanna to spend her final moments with her father.

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On their return to King's Landing the celebrations are cut short as the city holds a funeral for Joanna, the Northerners leave with Joanna's body to go back North. After the funeral Aeyron admits on the throne that the war was not worth it breaking down and crying.

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