Treethane Niriel is the Bosmer Treethane of the Bramblebreach Clan.
During Frighten the Fearsome she stops you from contacting the Wilderking, saying, "You people don't understand. The Wilderking manages the entire forest! He doesn't have time for idle talk." She suggests you remove the Wood Orcs from the surrounding forest to earn an audience. Once you remove the Orcs she admits her surprise, "Hmmph. I wasn't exactly expecting you to succeed." She then instructs you on how to petition the Wilderking.