Lisa's Dune Encyclopedia

Yueh, Doctor Wellington

Doctor Wellington Yueh is trained in the Suk way, meaning he is conditioned not to be able to harm his family. That conditioning is indicated on him by a diamond tattoo on his forehead. He is stick-thin and has long, black hair worn in a "Suk School" silver ring on his left shoulder. He also has a drooping moustache. Paul says he speaks with a "calm, high-pitched voice."

However, his Suk conditioning is broken by the Harkonnens, who convince him that they are torturing his true love, Wanna, a Bene Gesserit. Dr. Yueh betrays Duke Leto and causes his death on Arrakis. He does arrange for Paul and Jessica to escape with the ducal signet ring.

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