Former leader of the Klingon high council. K'Mpec was responsible for ther discommendation of the house of Mogh. Accusations by the Klingon House of Duras brought to light suspicions concerning Klingon aid to the Romulans during the Khitomer attack. Investigation by Ambassador K'Ehleyr revealed that Ja'rod of the House of Duras was actually to blame, but K'mpec decided that to reveal treachery in such a powerful house would lead to civil war, so the House of Mogh was officially blamed.

K'mpec was poisoned, probably by Duras, who sought to succeed him as council leader. K'mpec chose Federation starship captain Jean-Luc Picard as his arbiter of succession, knowing he would remain impartial.