Who is Miles Teg from Chapterhouse: Dune and what is their importance?

Miles Teg is the Bene Gesserit Sisterhood's greatest military hero, was killed on Rakis/Dune at the end of Heretics of Dune book, but cells scraped from his neck by his daughter, the Reverend Mother Superior Darwi Odrade, are used to restore him as the first Bene Gesserit-produced ghola. This novel shows the boy interacting with Odrade up to the age of ten, when the threat of the Honored Matres becomes so great that they must risk restoring Teg's memories, hoping he will retain the amazing speed he showed on Gammu in the last lifetime.