In A Game of Thrones, Viserys Targaryen and Illyrio Mopatis marry Daenerys Targaryen to Khal Drogo to get his support and warriors for the invasion of Westeros. After a tense wedding night with the pubescent Daenerys - neither speaking the other’s language - her growing sexual prowess and self-esteem ultimately result in his respect as a kind, sensitive, and loving husband. Initially reluctant against Viserys’ scheme to invade Westeros, executing his brother-in-law after a tense encounter. After a failed attempt on Daenerys's life, he vows to invade Westeros himself and claim the Iron Throne for their unborn son, but is wounded in a subsequent battle, developing a severe case of sepsis. Daenerys unwittingly sacrifices their unborn son to save him with blood magic. While this saves his life, he is left in a dumb, catatonic state. After offering herself to him one final night, a heartbroken Daenerys smothers him with a pillow. At his funeral pyre, she walks with her dragon eggs into the flames and emerges unscathed with three baby dragons. He posthumously becomes the namesake of her favorite dragon, Drogon.