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An advocate was the equivalent to a lawyer in Klingon law, and represented the accused in a trial before a Judge. Advocates were expected to fight for their client tenaciously, though the degree to which this expectation was filled varied greatly over the course of Klingon history.
Some noted Klingon advocates included Kolos in the 22nd century, Colonel Worf in the 23rd century, and Ch'Pok in the 24th century. (ENT: "Judgment"; Star Trek VI: The Undiscovered Country; DS9: "Rules of Engagement")