The formation of the Union
Flag (Union Jack) came about as the result of the progressive merging of the
inhabitants of the British Isles under one throne.
1603 - King James VI of Scotland inherited the English throne and became King James I of England.
1606 - the National Flags of Scotland and England were united for use at sea, thus making the first Union Flag
The first Union Flag (1606)
1707 - during the reign of Queen Anne, the first Union Flag was by royal proclamation made the National flag of Great Britain, for use ashore and afloat.
1801 - Ireland was united with Great Britain and the present Union Flag was formed.