Aa was — according to the protocols of the City of the Saved — the first human. In the City, Aa was also known as Great Mother of Humanity, First Ancestor, and Source of All. Thousands worshipped her.
In the City, Aa missed the many individuals from her original life who didn't qualify to be resurrected. She lived with many of her descendants in the recreation of the African plains in Mappamundi Great Park.
Lewis Greaves tried for years to interview Aa for The Book of Everyone. Each day, Greaves would greet Aa and follow her around for a while. It took 8 years before Aa ever said anything to him, "piss off"; after another decade they were close friends.