Flags of the United Kingdom: the flag of Northern Ireland (1953–1972) together with the flags of Scotland and of England (since the Middle Ages) and the flag of Wales (since 1959).
N.B.: Strictu sensu, this combination of flags was official between 1959 and 1972, but the banner of arms of the old Government of Northern Ireland (the "Ulster banner") continues to be used in some contexts; no official alternative exists.
This file was derived from:

 Flag of Northern Ireland (1953–1972).svg
Flag of Scotland.svg
Flag of England.svg
Flag of Wales.svg
Own work based on: Flag of Northern Ireland (1953–1972).svg: , Flag of Scotland.svg: , Flag of England.svg:   and Flag of Wales.svg: