Who is Quintinius Violet Chenoeh from God Emperor of Dune and what is their importance?

A Bene Gesserit novice, Chenoeh is elevated to sainthood and legend for millennia following her face-to-face meeting with the God Emperor Leto II. The interview shows him in complete control of history and realizing he has "achieved" something in Siona Atreides. Chenoeh dies in the 53rd year of her sisterhood of melange incompatibility while trying to become a Reverend Mother. Her verbatim account of the conversation with Leto is discovered only after her demise, per the Emperor's strict orders.