Well I Knew His Father Tried To Kill Him, But I Thought That He Killed His Mother Almost Right After Being Born. And I Heard (Didn't Watch The Exact Episode, But...) He Killed His Father In Self Defense.
Lux Arcadia from Undefeated Bahamut Chronicle. No one wanted to help him when his mother was injured in a carriage crash, which resulted in her death. Later on, his older half-brother, Fugil beheaded their father.