Knightmare Frames (ナイトメアフレーム, Naitomea Furēmu) are humanoid war machines developed by the Holy Britannian Empire. Unveiled during the invasion of Japan, Knightmare Frames are almost exclusively used in place, and sometimes alongside of the practically obsolete main battle tanks. The name "Knightmare Frame" is a play on the word "nightmare" and a knight's mare. There also exists a derivative type of war machine based on the Knightmare Frames called Knight Giga Fortress.