The longest presiding Chancellor ever, K'mpec ruled with an iron hand and through the Khitomer Massacre, which was the death of him. Duras sought to cover up his fathers actions in betraying the Klingons to the Romulans which K'mpec assisted in fingering Mogh as the betrayer. This was done unsuspecting of Kurn and Worf returning to Qo'noS to bring the truth to light. K'mpec spared both of Mogh's sons from death while retaining peace in the Council. K'mpec was eventually murded by Duras in 2367, poisoned with Viridium Six, but before dying appointed Picard as his Arbiter of Succession.