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"You want me to have a god? Fine. King Stannis is my god. He raised me up and blessed me with his trust. He gave you a future I could never have imagined. You know how to read, you'll be a knight some day. You think a fire-god commanded all that? It was Stannis, only Stannis."

"We've had vicious kings and we've had idiot kings, but I don't know if we've ever been cursed with a vicious idiot for a king."

―Tyrion Lannister to his nephew King Joffrey Baratheon

King Joffrey I Baratheon is a major character in the first, second, third, and fourth seasons. Though believed by most to be the eldest son of King Robert Baratheon and Queen Cersei Lannister, Joffrey is actually a bastard born from Cersei's incestuous relationship with her twin brother, Ser Jaime Lannister of the Kingsguard. He is the older brother of Myrcella Baratheon and Tommen Baratheon, both of whom share the same parentage with Cersei and Jaime Lannister.
He is the Grandson of Tywin Lannister and the Nephew of Tyrion Lanister. 

"When you play the game of thrones, you win or you die. There is no middle ground."

―Cersei Lannister to Eddard Stark

Cersei Lannister is the only daughter and eldest child of Lord Tywin Lannister of Casterly Rock and his wife, Lady Joanna Lannister. She is the twin of her younger brother, Ser Jaime Lannister. In the television adaptation Game of Thrones Cersei is played by Lena Headey, and is portrayed by Nell Williams in a Season 5 flashback.

After Robert's Rebellion, Cersei married King Robert IBaratheon and became Queen of the Seven Kingdoms. She is the mother of Prince Joffrey, Princess Myrcella, and Prince Tommen of House Baratheon of King's Landing.

"What wife would do the things I've done for you? What wife would trust you the way I've trusted you? When you gave me those drops and told me to pour them into Jon's wine. My husband's wine. And you told me to write a letter to Cat telling her it was the Lannisters..."

"I'm not trying to honor you. I'm trying to get you to run my kingdom while I eat, drink, and whore my way to an early grave."

―Robert Baratheon to Eddard Stark

Daenerys Targaryen

Queen Daenerys I Targaryen, also known as Dany and Daenerys Stormborn, is the younger sister of Rhaegar Targaryen and Viserys Targaryen, the paternal aunt of Jon Snow, and the youngest child of King Aerys II Targaryen and Queen Rhaella Targaryen, who were both ousted from the Iron Throne during Robert Baratheon's rebellion.