Flags of Great Britain: the flag of Wales (since 1959) together with the flags of Scotland and of England (since the Middle Ages) and the flag of Cornwall (since the 19th century).
This file was derived from:

 Flag of Wales.svg
Flag of England.svg
Flag of Scotland.svg
Flag of Cornwall.svg
Own work based on: Flag of Wales.svg: , Flag of England.svg: , Flag of Scotland.svg:   and Flag of Cornwall.svg: