Cersei and Jaime Lannister

Cersei and Jaime Lannister have been having an ongoing sexual and romantic affair for many years, since their youth - despite the cultural and religion taboos against brother-sister incest in Westeros. Even after Cersei was wed - in an arranged marriage - to King Robert Baratheon, she and Jaime continued their affair, now committing adultery as well. Shockingly, they continued to have their affair even as Cersei bore three children - all of them secretly fathered by her own twin brother Jaime, not her husband King Robert.

Cersei and Jaime were always close since their youth, and because the royal House Targaryen had been incestuously wedding brother to sister for nearly three centuries at the time, they didn't consider what they were doing to be particularly unusual - though the rest of Westeros certainly would now have approved if it ever became public knowledge, even before she committed adultery.

Ironically, Jaime was always faithful and loyal to Cersei, caring about her deeply and never being interested in any other woman - yet the same cannot exactly be said for Cersei. In her youth, Cersei hoped to be wed to Crown Prince Rhaegar Targaryen (possibly just for the social rank), and later was not above having sex with other men to manipulate them, such as their own first cousin Lancel (though she did this purely as a political manipulation, not with any romantic interest).

Cersei and Jaime have understandably had a very chaotic but very intense relationship, hidden from the rest of the world. Jaime could never publicly act in the social role of father to their three children: Joffrey, Myrcella, and Tommen. With Jaime physically unable to take a part in raising them, they were left with the drunken whore-monger Robert as an absent father as well. Cersei, their only remaining parent, doted on her firstborn Joffrey to the point of spoiling him rotten - though the boy was already a born psychopath to begin with, she didn't help, refusing to admit what a monster she had helped create through her bad parenting. Meanwhile, Cersei hypocritically ignored her two younger children, Myrcella and Tommen - hypocritically, as this is exactly how her own father Tywin had played favorites and doted on Jaime while ignoring Cersei and their younger brother Tyrion.

Appearances together
Copy-pasted from "Drogo and Daenerys", this listing is inaccurate.