Kopf's Cliff (informally known as "the Cliff") was a settlement on the planet Qo'noS, the location of the estates of the House of Graf. Kopf's Cliff was unique for its variety of architectural styles, borrowed from races conquered by the Klingons, most notably the Phebens. (KE novel: A Burning House)
History and specifics[]
The location was known as Kopf's Cliff by the time of Kahless the Unforgettable in the 9th century. Kahless himself knew of a story of two Klingon warriors who had built their houses on the Cliff. One time, a house burned down. The warrior from the other house perished while rescuing his fellow warrior's mate. The event was mentioned by author K'Ratak in his edition of the qeS'a'.
Ki'Var, brother of Lady Lukara, conquered Kopf's Cliff and Ketha Province for Warlord Kranx.
In the 24th century, K'Ratak himself was enrolled by his parents in the mok'bara school of Master K'Dar. Eventually, K'Ratak began to teach alongside K'Dar. (ST reference: The Klingon Art of War: Ancient Principles of Ruthless Honor)