Sheila (シーラ, Shīra) is Livius's mother. She passed away three years prior to the beginning of the story. Despite her deceased status, she is often seen in flashbacks.

Born as a girl of a nomadic tribe, she was later taken as a concubine by Leonidas III by force and lived in the isolated Silver Tower with her young son, Livius. She was assassinated three years prior. Her death was the motivating factor for Livius to conquer the world.