The House of G'Iogh was a Klingon House and an influential member of the Klingon Empire that operated in the 23rd century. In 2291, its head was Kalnor, son of G'Iogh, who rose up against the Empire and intended to become its new leader. This act plunged the Empire into a civil war, which ended when General Chang killed Kalnor in a blood duel. Despite the defeat of Kalnor, the leadership of his House fell upon the deceased leader's half-brother Melkor. Just like his predecessor, Melkor formed a conspiracy with four other Houses. Aided in secret by theRomulans, Melkor intended to claim for himself the position of Emperor of the Klingon Empire.