Great Britain is the official name given to the two kingdoms of England and Scotland, and the principality of Wales. The United Kingdom (UK) includes these areas as well as Northern Ireland. Britain refers to only England and Wales, though some will shorten Great Britain with this term.
"Charles I (Prince of Wales)", c. 1623, by an unknown artist after Daniël Mijtens (Dutch, c. 1590-1647/48). Charles I (19 November 1600 – 30 January 1649) was monarch of the three kingdoms of England, Scotland, and Ireland from 27 March 1625 until his execution in 1649.