The flag of the United Kingdom, known as "the Union Jack", is made up of three crosses. The upright red cross is the cross of St George, the patron saint of England. The white diagonal cross (with the arms going into the corners) is the cross of St Andrew, the patron saint of Scotland. The red diagonal cross is the cross of St Patrick, the patron saint of Ireland. St David is the patron saint of Wales but it is not represented on the Union Jack because when the first Union Jack was created in 1606, Wales was already united with England since it was conquered by Edward I in the 13th century. In 1536, under Henry VIII, the Act of Union joined England and Wales officially and they both came under the flag of England.
