The Great North Window is the vast stained-glass window at the north end of Westminster Hall, one of the oldest surviving parts of the Palace of Westminster. It is the big focal point you see after climbing the stairs into the hall, and it has long been the hall’s most dramatic visual feature.
 
Westminster Hall itself dates back to the late eleventh century and was later rebuilt and altered, so the window sits within a building layered with many periods of work. That is part of what makes the Great North Window interesting: it is both an architectural feature and a record of changing tastes, restoration, and ceremonial use.