The Union Jack.
Everybody has seen the banner of the United Kingdom of Great Britain and Ireland. It is formed of a combination of the crosses of St. George (England), St. Andrew (Scotland), and St. Patrick (Ireland). The first Union Jack was introduced in 1606, three years after the union of Scotland and England, and showed, of course, only the first two crosses. A century later (July 28, 1707), this standard was made, by royal proclamation, the national flag of Great Britain. On the union with Ireland a new union banner was needed, and the present ensign was accordingly devised.
glendower's oak.