Joanna Lannister, is an unseen character mentioned in the second season. She is deceased when the events of the series begin and is not expected to appear in the series. Lady Joanna is the wife of Tywin Lannister and the mother of Jaime Lannister, Cersei Lannister and Tyrion Lannister.
Joanna was the wife of Tywin Lannister, the head of House Lannister and the Lord of Casterly Rock. Joanna bore him the twins Jaime and Cersei. She died giving birth to Tyrion. Joanna died when Cersei and Jaime were only four years old. Tywin took Joanna's death very hard, as did Cersei, who holds Tyrion responsible for her death.
|Kevan Lannister||Tywin Lannister|
|Cersei Lannister||Jaime Lannister||Tyrion Lannister|
In the books
In the A Song of Ice and Fire novels, Joanna was a first cousin of Tywin, the daughter of one of his father Tytos' brothers. Thus her full name was already "Joanna Lannister" before she married Tywin. She was the sister of Ser Stafford Lannister.
Though Tywin was always a stern and ruthless man, Joanna was said to bring out what little warmth he had, and he was even known to smile in her presence. Tywin and Joanna were very deeply in love, and thus Tywin took her death very hard. He became even more stern and was never known to smile again. Her death also fueled his unreasoning hatred for his younger son Tyrion, whom he blamed for killing her, combined with the shame he brought on their House for being born a dwarf.
According to the books, Cersei and Jaime were eight or nine years old when their mother died, while in the TV series Cersei said she was four years old.
|Lord:||Lord Tywin Lannister||Heir:||Tyrion Lannister (disputed)|
|Seat:||Casterly Rock||Lands:||The Westerlands|
|Title(s):||Lord Paramount of the Westerlands · Lord of Casterly Rock · Warden of the West · King of the Rock (pre-War of Conquest)|
|Ancestors:||Lann the Clever · Loren Lannister|
|Current members:||Kevan Lannister · Cersei Lannister · Jaime Lannister · Dorna Lannister · Lancel Lannister · Cynda Lannister · Sansa Stark|
|Deceased members:||Tytos Lannister · Joanna Lannister · Stafford Lannister · Alton Lannister · Martyn Lannister · Willem Lannister|
|Household:||Podrick Payne · Bronn · Gregor Clegane · Amory Lorch · Polliver · Rorge · Biter|
|Overlord:||House Baratheon of King's Landing|