You have read that Muad'Dib had no playmates his own age on Caladan. The
dangers were too great. But Muad'Dib did have wonderful companion-teachers.
There was Gurney Halleck, the troubadour-warrior. You will sing some of
Gurney's songs, as you read along in this book. There was Thufir Hawat, the old
Mentat Master of Assassins, who struck fear even into the heart of the Padishah
Emperor. There were Duncan Idaho, the Swordmaster of the Ginaz; Dr. Wellington
Yueh, a name black in treachery but bright in knowledge; the Lady Jessica, who
guided her son in the Bene Gesserit Way, and -- of course -- the Duke Leto,
whose qualities as a father have long been overlooked.

-- from "A Child's History of Muad'Dib" by the Princess Irulan
--[dune]--