Alexander Siddig will play Doran Martell, the ruling lord of Dorne and the older brother to Prince Oberyn Martell (Pedro Pascal). Doran Martell is described as even-tempered and deliberate.
Toby Sebastian will play Trystane Martell, son to Prince Doran and heir to the Dorne. He's betrothed to Mycrella Baratehon as part of an alliance offered by Tywin Lannister (Charles Dance).
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