Before becoming immortal, C.C.'s Geass, as contracted with a nun during apparently medieval times, granted her the power "to be loved," which allowed her to make anyone around her love her. She originally started with a Geass symbol in her left eye, but as she matured, she eventually developed another in her right, implying that she became unable to control it, causing everyone to love her. After C.C. had become bored by the tranced society around her, the nun who had bound the Geass contract to her shifted her immortality into C.C., as signified by the Geass sigil on her forehead. The nun died in the process and, as part of the exchange, C.C. became immune to the effects of Geass while losing her original. Her Geass sigil/mark is located on her forehead, becoming red when activated.