Painted Chamber
noun
A chamber in the old Palace of Westminster in London (destroyed by fire in 1834), whose walls were decorated with a series of battle scenes and in which from 1339 Parliament often assembled, or (occasionally) the sovereign met the two Houses of Parliament (now historical ); any of various similarly decorated chambers in other palaces, halls, etc.
Origin
Mid 16th century. After Anglo-Norman Chaumbre Peynte, Chaumbre de Peynte.