David Eddings Wiki
This page is written in the in-universe perspective of the "Garion" series' of novels.

Youngest son of Brand; brother of Verdan, Kail, and Brin. Out of a misguided attempt to save his father's position of authority, he attempted to assassinate Garion shortly after his coronation. Garion eventually solved the mystery and confronted Olban, who repented. He swore to protect Garion's then fiancée Ce'Nedra with his life. He stayed by her side constantly, but at the Battle of Thull Mardu after the death of Doroon, Ce'Nedra ordered him into the fray. Olban was wounded in the battle, and confessed his crimes to his father while in his deathbed. Brand refused to forgive him.

"Please, father," Olban begged. "Don't you have one tear for me?"
Enchanter's End Game

but that wasnt true. His father did cry, and did mourn his death. even if he never said he forgave him.