Lord Jason Lannister was the head of House Lannister, Lord of Casterly Rock, and Warden of the West during the reigns of Viserys I and Aegon II in HBO's House of the Dragon. He was the identical twin of Ser Tyland Lannister and a son of Lady Ceira Lannister.
A proud hunter and warrior, he once vied unsuccessfully for the hand of Princess Rhaenyra Targaryen. When the Dance of the Dragons broke out he declared for the Greens, calling his banners and mustering the armies of the Westerlands at the Golden Tooth. This overview summarizes his on-screen role; see the Timeline and sourced statements for detail.
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