Tytos Lannister

Lord Tytos Lannister is a character mentioned in Game of Thrones.

He was once head of the powerful House Lannister, one of the richest and most influential families in Westeros. He was the father of Tywin Lannister, and grandfather of Cersei, Jaime, and Tyrion.

The Pointy End
When arriving at his father's encampment with a number of hill tribe leaders, Tyrion Lannister introduces his father to them, calling him "Tywin, son of Tytos".

In the books
In the 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. This made his son mistrust laughter, and become a hard and cold man.