Olivia Vorbarra Vorkosigan was a Princess of House Vorbarra and Countess of House Vorkosigan. Her father was Prince Xav Vorbarra and her mother was Betan. She married Piotr Pierre Vorkosigan and was the mother of Aral Vorkosigan as well as another son and daughter. Her sister was Sonia Vorbarra Vorpatril.
Olivia was killed in Yuri's Massacre.
Several books speak of her. Two give her name:
- A Civil Campaign chapter 17
- Cryoburn chapter 9
- See author discussion at http://lists.herald.co.uk/pipermail/lois-bujold/2010-September/055474.html