To cover the truth that he had killed his parents, Renard was sent to be adopted by another family. A peaceful family without a son who wishes to have children of their own even if they aren't related by blood. His sister was also brought by another family and since grew up without ever remembering the fact that their parents had sent her to be bought because she was still a virgin, allowed to be killed if she doesn't bear a son.
Afraid that the truth was known, Renard had always lied about his peaceful family situations that even his close ally Karnala wouldn't have known.
It wouldn't have been possible if it wasn't for Cassius, the crown prince who had noticed the truth behind his murder, and so since then Renard who followed him into the battlefield promised to protect him, even if it cost his life.