"The Treasons at Tumbleton" is the eighth episode and season finale of the third season of the fantasy drama television series House of the Dragon. A prequel to Game of Thrones, the series depicts the events leading up to the decline of House Targaryen during a devastating war of succession for the Iron Throne of Westeros known as the "Dance of the Dragons". The episode was written by showrunner Ryan Condal and Ti Mikkel and directed by Andrij Parekh. It first aired on HBO and HBO Max on August 9, 2026.

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