'Game Of Thrones' Season 5 Castings Announced: Meet Oberyn’s Family

Keisha Castle-Hughes, Alexander Siddig, Rosabell Laurenti Seller Keisha Castle-Hughes, Alexander Siddig, Rosabell Laurenti Seller

The cast of "Game of Thrones" is growing.

At Comic-Con on Friday, HBO showed a clip reel during their presentation in Hall H, announcing several of the actors joining the cast – including who is playing the late Prince Oberyn Martell's older brother.

Alexander Siddig (most recently of Starz's "Da Vinci's Demons") will play Doran Martell.

PHOTOS: 'Game Of Thrones' Season 5 -- Meet The Cast

"Doran Martell is the ruling lord of Dorne and older brother to the late Prince Oberyn Martell. Unlike his brother, Doran is even-tempered and deliberate. Now, all of Dorne waits to see how their lord will react to his brother’s death," HBO said in a release, about the character.

Toby Sebastian will play Prince Doran's son and heir, Trystane Martell. His father betrothed him to Myrcella Baratheon (Cersei and Jaime's biological child, but thought of in the realm as Cersei and the late King Robert Baratheon's daughter) as part of the alliance offered by Tywin Lannister, then Hand of the King.

Nell Tiger Free is now playing Myrcella Baratheon (she was previously played by Aimee Richardson). Myrcella has been a guest and ward of Prince Doran, betrothed to his son, but her position has become tenuous with the death of Oberyn Martell, the Prince’s brother.

DeObia Oparei has been cast as Areo Hotah, the long-serving captain of Doran Martell’s palace guard, renowned for his loyalty and his longaxe, per HBO.

Enzo Cilenti is playing Yezzan, an "extremely wealthy slave trader" before Daenerys Targaryen (Emilia Clarke) outlawed the slave trade.

Jessica Henwick will join the cast as Nymeria (“Nym”) Sand. Nym Sand is the second eldest of the late Prince Oberyn’s bastard daughters. Her mother was an Eastern noblewoman who brought Nym up to be cultured, graceful and deadly with a whip.

Keisha Castle-Hughes (who is also in the new "Star Wars" film) is playing Obara Sand. "A fearsome warrior, Obara Sand is the eldest bastard daughter of the late Prince Oberyn Martell. Her mother was a Dornish peasant girl who caught the eye of the late Prince," per HBO's character description.

Jonathan Pryce (from the "Pirates of the Caribbean" film franchise) is playing the High Sparrow, who is described as, a "devout and pious man, the High Sparrow came to King’s Landing to serve those forgotten by much of the world – the poor, the downtrodden and the infirm – and quickly amassed a large following. His fellow believers have swarmed over the city, ministering to the lowest and decrying the corruption of the highest," per HBO.

Season 5 of "Game of Thrones" premieres in 2015 on HBO.

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