Development of the Union Jack: the cross of St. George (flag of England) was combined with the saltire of St. Andrew (flag of Scotland) to form the flag of Great Britain. The flag of Great Britain was then combined with the red saltire of the insignia of the 1783 royal Order of St. Patrick (not the flag of Ireland) to form the flag of the United Kingdom.
Flags of the Union Jack named en.svg
Flags of the Union Jack named en.svg: Guilherme Paula
Derivative work: Hogweard, Master Uegly