Scotland, most northerly of the four parts of the United Kingdom, occupying about one-third of the island of Great Britain. The name Scotland derives from the Latin Scotia, land of the Scots, a Celtic people from Ireland who settled on the west coast of Great Britain about the 5th century CE. The name Caledonia has often been applied to Scotland, especially in poetry. It is derived from Caledonii, the Roman name of a tribe in the northern part of what is now Scotland.