Knightmare Frames (ナイトメアフレーム Naitomea Furēmu?), or simply Knightmares, officially designated as the Humanoid Autonomous Armored Knight, are a form of mecha in the Sunrise anime series Code Geass: Lelouch of the Rebellion. In the series, they were developed by the Holy Britannian Empire. Unveiled during the invasion of Japan, Knightmare Frames are almost exclusively used in place of the practically obsolete main battle tanks. The name "Knightmare Frame" is a play on the words knight, mare (as in a horse, a Knight's steed), and nightmare The Burai (無頼, Burai) is a remodeled version of the Glasgow manufactured by the Kyoto House and used by the Black Knights and the Japan Liberation Front. It is basically the same as a Glasgow, except for the head, which has fang-like cheekbones which give the appearance of an oni. It also features a torso-mounted antipersonnel machine gun. Its hands have also been refurbished so that they can guard, a feature exclusive to the Burai. Lelouch pilots a customized unit with a red head module and golden horns resembling those on a samurai's helmet. Like the Sutherland, variants exist including close combat and electronic warfare types.