Wiki of Westeros

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Wiki of Westeros
Wiki of Westeros
Not to be confused with Jason Mallister.
House Lannister
House Lannister

"That man's pride has pride."
―King Viserys I Targaryen on Jason Lannister[src]

Lord Jason Lannister is the head of House Lannister, Lord of Casterly Rock, and Warden of the West during the reigns of Viserys I and Aegon II.



Jason is the son of Lady Ceira Lannister and identical twin of Ser Tyland Lannister. He is the head of House Lannister during the reign of King Viserys I Targaryen.[1] Although he is entitled the titles "Lord of Casterly Rock and Warden of the West," he instead is styled as Lord Paramount of the West and Master of Casterly Rock.[3]

House of the Dragon: Season 1[]

Jason is part of the royal hunt in the Kingswood for Prince Aegon Targaryen's second nameday. He vies for Rhaenyra's hand, which Viserys hopes she will accept to arrange a marriage pact, but Rhaenyra rejects him. Jason later presents Viserys with the spear he uses to kill the hart. When Jason questions the succession, Viserys reminds him that it is his duty to inform him of any "rebellion" against him. Jason and his brother later sit alongside Lord Hobert Hightower when they witness the bloody Rhaenyra return to camp.[1]

Jason later attends the wedding of Rhaenyra and Ser Laenor Velaryon with his brother. He congratulates Viserys on the marriage, and asks where Queen Alicent Hightower is. When Viserys informs him she is still getting prepared, he jests that men wage war because women would not make it in time for battle. Rhaenyra slyly tells Jason that his presence is always appreciated.[3]

When the Dance of the Dragons starts, Prince Daemon says that the Blacks cannot count on the support of the Lannisters due to Tyland sitting on the Green Council.[2]

House of the Dragon: Season 2[]

Following the outbreak of the Dance of the Dragons, Lord Jason calls his banners and begins amassing the armies of the Westerlands at the Golden Tooth. His twin, Ser Tyland, relays this news to the Green Council.[5]


Jason is a hunter and a warrior. He is arrogant[6] and proud.[1]


Spoken by Jason[]

"This is why men wage war... because women would never be ready for the battle in time."
―Jason Lannister[src]

Spoken about Jason[]

Viserys: "Jason Lannister is a fine match."
Rhaenyra: "He's arrogant and self-serious!"
Viserys: "Well I thought you might have that in common!"
— Viserys and Rhaenyra argue over Jason being a suitor for her hand in marriage[src]
"That man's pride has pride."
―Viserys complains about Jason[src]




Westerling[a] House Westerling



Behind the scenes[]

On September 24, 2021, HBO announced that Jefferson Hall had been cast in the dual role of twins Tyland and Jason Lannister for House of the Dragon. Jason's character description for Season 1 reads as follows:

"The Lord of Casterly Rock and twin to Ser Tyland Lannister."[7]

His character description for Season 2 reads as follows:

"The haughty Lord of Casterly Rock and twin to Ser Tyland Lannister."[8]

In the books[]

According to Fire & Blood and The World of Ice & Fire, Lord Jason Lannister was the twin brother of Ser Tyland Lannister, and both vied for the hand of Rhaenyra Targaryen in their youth in 112 AC without success.

In the books, Tyland (or any member of House Lannister, for that matter) never uses the titles "Lord Paramount of the West" or "Master of Casterly Rock". When House Lannister bent the knee to Aegon the Conqueror, he named them Wardens of the West. The title of Lord Paramount is given to the Great Houses who rule over their constituent regions (for example, House Tully are Lords Paramount of the Trident and House Baratheon are Lords Paramount of the Stormlands), to signify that they stand paramount over the other vassal houses beneath them. The Lannisters, like the Starks and Arryns, do not typically use the title Lord Paramount, since it is more or less synonymous with Warden. It is possible that, in the show, Jason prefers to use a different style of address, although it would be unconventional. It is equally possible that the titles are an unintentional mistake, conflating "Warden of the West" and "Lord Paramount" into a singular title.

Similarly, "Master of Casterly Rock" is an invention of the TV series. "Masterly" houses, such as House Glover, House Tallhart, and House Harlaw, do exist. They are of unclear hierarchy in Westerosi nobility, although they appear to stand above landed knights but below full lords. It would be unlikely for the head of House Lannister, the ruling Great House of the Westerlands, to use a masterly title.




  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 House of the Dragon: Season 1, Episode 3: "Second of His Name" (2022).
  2. 2.0 2.1 House of the Dragon: Season 1, Episode 10: "The Black Queen" (2022).
  3. 3.0 3.1 3.2 3.3 House of the Dragon: Season 1, Episode 5: "We Light the Way" (2022).
  4. Histories & Lore: Season 6, Short 1: "The Old Way" (2016).
  5. House of the Dragon: Season 2, Episode 1: "A Son for a Son" (2024).
  6. Jason Lannister. HBO. Retrieved March 15, 2023.
  7. Unknown author (Unknown date). House of the Dragon S1 | Character Descriptions. Warner Bros. Discovery. Retrieved April 25, 2023.
  8. Unknown author (Unknown date). House of the Dragon S2 | Character Descriptions. Warner Bros. Discovery. Retrieved June 5, 2024.
  9. Wake the Dragon (May 15, 2024). Lord Jason Lannister and his forces arrive at the Golden Tooth on the border with the Riverlands.. X. Retrieved May 20, 2024.


  1. Conjecture based on information from Fire & Blood; may be subject to change.

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