Klingon had no word for peacemaker until the Klingons encountered deaf mediator Riva of Ramatis III, who helped negotiate several treaties between the Klingons and the Federation. Worf didn't view it as a compliment. (TNG "Loud as a Whisper")

Which is obviously bunk, since rojmoHwI' is a pretty easy word to figure out. Maybe he means the word didn't become a meme until Riva. (va... qatlh mu'vetlh lulo'taH Hoch ghotpu'? naH jajmeywIj rojmoHwI' DISaHbe'; maSuv neH!)

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SuStel
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