The Union Jack or Union Flag is the national flag of the United Kingdom. While no law has been passed making the Union Flag the national flag of the United Kingdom, it has become one through precedent
A portrait of a ship, with the Union Jack placed on a jackstaff at the ship's bow, 1637
Linlithgow Palace ceiling boss with conjoined flag design, c. 1617
Slezer's Edinburgh Castle c. 1693 depicting the Scottish Union flag
The Union Jack flown from HMS Spartiate during the Battle of Trafalgar (1805), showing the 1801 flag design
The flag of Great Britain, often referred to as the King's Colour, Union Flag, Union Jack, and British flag, was used at sea from 1606 then more generally from 1707 until 1801 as the flag of the Kingd
Replica of early 17th century English ship Godspeed, with Union flag in her “main-toppe” and that of England in her “fore-toppe”
Continental Union Flag, featuring early Union Flag in the canton, outside City Hall, San Francisco