- "He was a good man. But a weak man... a weak man who nearly destroyed our House and name."
- ―Tywin Lannister
Tytos Lannister is an unseen character in Game of Thrones. He is deceased when the events of the series begin. He is not expected to appear in the series. He was the Lord of Casterly Rock and head of House Lannister. He is the grandfather of the major characters Cersei, Jaime, and Tyrion Lannister.
He was once Lord of Casterly Rock and head of House Lannister, one of the Great Houses of Westeros. The Lannisters are the richest and one of the most influential families in Westeros. He is the father of Tywin Lannister, and grandfather of Cersei, Jaime, and Tyrion.
Lord Tytos raised the kennelmaster of Casterly Rock to knighthood after the latter saved him from a lioness that tried to kill him. He also granted lands, a keep, and the kennelmaster's son was taken as a squire. Thus House Clegane was born.
Tytos presided over a period of decline for the House. He frittered away much of their fortune on poor investments and allowed himself to be mocked at court creating a perception of weakness. Their vassals House Reyne of Castamere rebelled against Lord Tytos. Tywin put down the rebellion personally, extinguishing their house and re-establishing the fearsome reputation of House Lannister. His ruthlessness gave darker meaning to the common phrase "A Lannister always pays his debts" and was immortalized in the song "The Rains of Castamere".
At Harrenhal, Tywin recalls watching Tytos growing old to his cup-bearer. Tywin believes that his father loved him and was a good man but weak. He blames Tytos for endangering their house and name. 
In the books
In the A Song of Ice and Fire novels, Lord Tytos was called a kind but weak man. He loaned money to lords who never bothered to repay him and his vassals openly ignored his orders, mocking him in open court. This made his son Tywin mistrust laughter, and become a hard and cold man.
Tytos once imprisoned an unruly bannerman, Lord Tarbeck. Lady Ellyn Tarbeck responded by capturing three Lannisters, including Stafford Lannister, and demanded the release of her husband, otherwise the three hostages would be killed. Young Tywin suggested his father to oblige by sending back Lord Tarbeck in three pieces, but gentle Tytos complied to the threat and released the prisoner. Some time afterward, the Tarbecks joined with House Reyne in rebellion, it was Tywin who dealt with the upstart houses and he annihilated both the Tarbecks and the Reynes.
According to Kevan, Lord Tytos' allowed his mistress - a woman scarcely one step above a whore - to move into their castle, act as if she was mistress of the Rock, demanded and wore his late wife's jewels, and even spoke for Tytos when he was sick. She grew so influential that it was said in Lannisport that any man who wished for his petition to be heard should kneel before her, for Tytos' ears were between her legs. After Tytos' died of a heart attack while climbing stairs to see her, Tywin sent her naked and penniless out the front gate. For further humiliation, she was forced to walk naked through the streets of Lannisport for two weeks, and to confess to every man she met that she was a thief and a whore. Although no man laid a hand on her, that was the end of her power.
|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|