TTC - quite correct. The original Union Flag was created in 1606 as a result of The Union Of The Crowns in 1603 (When The English ran out of monarchs and James VI of Scotland became James 1 of England and Scotland) At that time, the flag was only formed of the flags of Scotland (Saltire) and England (St George's Cross) Wales was represented by The English flag as it was considered part of England at that time. From 1606 until The Union Of The Parliaments in 1707, that original flag was mainly used at sea (flying from the jackstaff of one of HMS) which is probably why it was called The Union Jack. In 1801, the flag of Ireland (as it was then - the cross of St Patrick) was added creating the current flag. In 1908, the name 'Union Jack' was deemed to be the national flag.