Cersei is the only daughter of Tywin Lannister, the richest man in the Seven Kingdoms. Even before she was married off to Robert Baratheon, she was involved in an incestuous relationship with her twin brother Jaime. Like her father, Cersei is interested in maintaining her position of power. She has committed herself to punishing her brother Tyrion, whom she holds responsible for the death of her son Joffrey.
After Rhaegar Targaryen kidnapped his fiancée, Lyanna Stark, Robert Baratheon led a rebellion against the Mad King Aerys Targaryen. Aided by his childhood friend, Lyanna's brother, Ned Stark, Robert was subsequently crowned king. When he died suddenly in a hunting accident, his heir Joffrey claimed the throne.
Jaime is the twin brother of Queen Cersei. A celebrated knight and member of the Kingsguard, he violated his oath to protect the royal family when he slew the Mad King. Ever since, his reputation as "The Kingslayer" has dogged him. After Jaime was captured by the Stark army, Brienne of Tarth escorted him back to King's Landing in the hopes of trading him for the Stark girls. Brienne and Jaime developed a mutual respect for each other during their journey, but the trip was not without peril: Jaime lost his sword hand to Roose Bolton's henchman, Locke, along the way.
What Tyrion lacks in size and strength, he makes up for in mental acuity. He served as Hand of the King in his father’s absence, and although few know it, it was Tyrion who hatched the plan that saved King’s Landing from Stannis Baratheon’s attack. Tyrion now stands accused of King Joffrey's murder.
Sansa grew up dreaming of a courtly world of knights and princes. Unfortunately, her northern naivety didn't help her in King's Landing, where her former fiancé, King Joffrey Baratheon, routinely abused her. After her engagement to Joffrey dissolved, Sansa was married to his uncle Tyrion Lannister, who treated her with the utmost respect. With Littlefinger’s help, Sansa fled to the Eyrie after Joffrey’s murder.
A massive knight who stands more than seven feet tall, Ser Gregor Clegane is known as “The Mountain That Rides.” He has served the Lannisters as a vicious thug along with his brother, Sandor Clegane, but the two bear no love for each other. During the wartime sack of King’s Landing, Gregor raped and murdered Elia, wife of Prince Rhaegar, and killed their two young children.
A Lannister bannerman, Ser Amory caught Arya Stark stealing correspondence at Harrenhal. To protect herself, Arya gave Amory's name to Jaqen H'ghar, who promptly killed him.
A sellsword who fought on behalf of Tyrion Lannister when Lysa Arryn demanded a trial by combat, Bronn became Tyrion's personal bodyguard. During Tyrion's term as Joffrey's Hand, Bronn served as Commander of the City Watch. Although he no longer holds that post, he was knighted for his bravery during the Battle of Blackwater.