Oberyn Martell

Oberyn Nymeros Martell, nicknamed the Red Viper, is a fictional character in the A Song of Ice and Fire series of epic fantasy novels by American author George R. R. Martin and its television adaptation, Game of Thrones, in which he is portrayed by Pedro Pascal. Introduced in 2000's A Storm of Swords, Oberyn is the youngest brother of Doran and Elia Martell from the desert kingdom of Dorne. Unlike his sickly and pensive brother, Oberyn is notorious for both his dangerous and unpredictable nature and his affinity for poisons, for which he earned his nickname. He is subsequently sporadically mentioned in A Feast for Crows and A Dance with Dragons. As his brother is sickly, he travels to King's Landing in his place in order to claim the Dornish seat on the small council, as well as to seek vengeance for his sister Elia's death at the hands of Ser Gregor Clegane, whom he suspects acted directly on orders from Tywin Lannister.