flag of a constituent unit of the United Kingdom, flown subordinate to the Union Jack (United Kingdom, flag of the), that consists of a white field (background) with a red cross known as the Cross of St. George.

The origin of the flag, its association with St. George (George, Saint) (the patron saint of England), and its adoption by England all lack thorough and clear documentation. At the Church of St. George in Fordington, England, there is a sculpture of St. George on a horse leading the Crusaders to victory at the Battle of Antioch (June 1098); his flag bears a cross. It is known that English Crusaders used a red flag with a white cross about 1189. Another record, dating from 1277, attests that a red Cross of St. George on white was used for pennants flown by the troops of King Edward I. The same flag, referred to as the Banner of Victory, was early shown in artistic representations of Christ; the flag was only later attributed to St. George in his role as patron saint of soldiers. Some evidence suggests that a flag of this design flew on English ships in the late 13th century. As part of the Union Jack and various other British flags, the Cross of St. George today continues to play an important symbolic role, although when England and Scotland joined to form Great Britain in 1707 their flags lost individual international status. See also Scotland, flag of.