Jaime is the eldest son of Lord Tywin Lannister and Lady Joanna of Casterly Rock.As a boy, he served as a squire to Lord Sumner Craher and followed him to eliminate the Kingswood Brotherhood.

When he was fifteen years old, he was personally knighted by Sir Arthur Dayne, the Sword of Dawn, for his bravery in battle.

In the same year, he was elected to the Kingsguard by King Aerys Targaryen II, making him the youngest member in the history of this legendary knightly team that enjoys a high reputation.

During the Usurper's War, he killed Aerys II to save the people of King's Landing from being burned to the ground. However, he was called the “regicide” by the world, and he was despised by the people and lost himself.

After the war, he had three children through incest with his twin sister Cersei Lannister.