Treen
Ambassador Treen was a Kradin delegate during the 2370s. 

In 2374, the crew of the  contacted Treen to enlist his people's assistance after Commander Chakotay was captured by the Kradins' enemies, the Vori. Treen beamed aboard the Voyager with two assistants to negotiate with Captain Kathryn Janeway.

After Chakotay's successful rescue from the Vori, Treen attempted to express his relief at his safe return. During his imprisonment by the Vori, however, Chakotay had been subjected to an extensive brainwashing scenario designed to make subjects hate the Kradin. Accordingly, he was not receptive to the Ambassador's friendly overtures, even after learning the truth. ()

External link 
 

nl:Treen
de:Treen
Kradin
Ambassadors