History of the United Kingdom

UNITED KINGDOM
The title of the former political unity composed of:
-England
-Wales
-Scotland
-Ireland northern
Officially adopted on January 1st, 1801, when the act of union between great Britain and Ireland came into force. The name great Britain has been used since the union of the Kingdoms of England and Scotland in 1.707 as the official designation of the united countries.
When, in 1922, 26 Irish countries were severed from the United Kingdom and sended into dominion of the British empire under the name of the Irish free state, no provision was made in the act for any change in the royal style or in the title of the imperial parliament.
From 1922 onward, however, the tittle of United Kingdom of Great Britain and north ireland was frequently used in official documents to designate those parts of the British Isles represented in the imperial parliament, meeting at Westminster.