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Before she gained the power of Geass, C.C. was a ten-year-old orphaned slave. A nun gave C.C. the power of Geass that made everyone fall in love with her. She grew tired of the love without limits and focused more on the nun, the only one who was above C.C.'s power. However, when C.C.'s power evolved to its highest point, the nun revealed that she never cared for C.C. and was only using her so that she could escape her immortal life. A shock sequence in the first season finale shows memories of her past, including repeated "deaths" of different types spanning centuries. In a special feature included in the series' fifth DVD, she and Lelouch discuss Washington's Rebellion, during which she speaks of participants such as George Washington and Benjamin Franklin as if she had been close friends with both. She claims to have entered into contracts with hundreds of people over her lifetime, almost none of which could reach the point of taking on her immortality.

One of her previous contracts was with Marianne, Lelouch's mother. When she aided Marianne with helping Charles achieve his goal, C.C. was made head of the Geass Order, a secret organization that studies and produces Geass users. However, when news of Marianne's death came to her, C.C. left the order, leaving V.V. to take over the operations. It would only be later that C.C. was captured by a Britannian envoy under Clovis, who took an interest in the girl's immortality and intended to bring her to Pendragon. However, that led to a chain of events to occur in the ruins of Tokyo.