"The Green Council" is the ninth and penultimate episode of the first season of the fantasy drama television series House of the Dragon, a prequel to Game of Thrones. The episode was written by Sara Hess and directed by Clare Kilner. It first aired on HBO and HBO Max on October 16, 2022.

The plot follows the aftermath of Viserys' death in King's Landing, starting with a discussion of Viserys' last words heard by Alicent in the previous episode regarding Aegon the Conqueror's dream, which she misinterprets as Viserys wanting their son Prince Aegon to be his successor. It ends with the coronation of Aegon, which leads to Rhaenys intruding the ceremony with her dragon Meleys.

In the United States, "The Green Council" garnered a viewership of 1.5 million during its premiere night on linear television alone. It was met with mostly positive reviews, with critics praising the character development, pacing, tension, musical score, shock value, set-up for the finale, and performances, particularly those of Eve Best, Olivia Cooke, Tom Glynn-Carney, and Rhys Ifans.

Alicent tells Otto that King Viserys' dying wish (which she misinterpreted) was that their son Aegon succeed him rather than his daughter and chosen heir, Rhaenyra. Otto delays publicly announcing the king's death and convenes a Small Council meeting. Alicent, Ser Harrold Westerling, and Lord Lyman Beesbury are stunned that Otto and the other council members have secretly plotted to crown Aegon as king. Lord Beesbury protests, denouncing the others as traitors, but Ser Criston kills him, seemingly by accident. Alicent refuses her father's insistence that Rhaenyra and her children should be executed, and Ser Harrold resigns as Lord Commander rather than carry out such an order. Criston is then named to replace him. Mysaria learns of the king's death through a signal from her spy, Talya.

Otto and Alicent separately race to find and influence Aegon, who has fled the Red Keep. Otto sends two Kingsguard knights, twin brothers Ser Erryk and Ser Arryk Cargyll to search the city, while Criston and Prince Aemond assist Alicent. In Flea Bottom, the Cargyll twins check a fighting arena Aegon frequents, where children, including Aegon's own bastard offspring, are forced into mortal combat as entertainment. An intermediary leads them to Mysaria who is willing to hand over the captive Aegon in exchange for a crackdown on the fighting pits and oversight of her spy network. The Cargylls find Aegon, but Criston and Aemond intercept them. Alicent mandates that Rhaenyra be given the chance to renounce her claim to the throne.

Otto summons several lords and ladies of the realm, coercing them into breaking off their pledges of support to Rhaenyra and swearing allegiance to Aegon; those who refuse to do so are imprisoned or put to death. Lord Larys Strong, in his role as Lord Confessor, obtains the identity of the White Worm, and learns of Otto's dealings. He passes this on to Alicent, who instructs him to have Mysaria's brothel burned to the ground. Alicent tries to win over Princess Rhaenys Targaryen's support, holding her captive in the Red Keep, but Rhaenys refuses and mocks her for her submission to the men in her life. Erryk, recognizing that Aegon will be nothing more than a puppet king, decides to flee the city, taking Rhaenys with him.

At Aegon’s coronation in the Dragonpit, Otto announces Viserys' death and Aegon is crowned king by Criston before the smallfolk. Rhaenys, separated from Erryk among the crowds, enters the Dragonpit's lower caverns, mounting her dragon, Meleys. Rhaenys and Meleys then burst through dragonpit's floor, causing death and destruction and threatening the royal family before flying away.

"The Green Council" was written by Sara Hess, marking her second episode as writer for the series, following "The Princess and the Queen".