In 1603, James VI of Scots, son of Mary Queen of Scots, was invited to take the throne of England. This made him both King of England and King of Scots (Kings in Scotland are always called King of Scots, never King of Scotland).
In 1707 the Treaty of Union united the British Isles into the United Kingdom of Great Britain. But Scotland still has its own identity.
Many years ago two different groups of people lived in Scotland: Highlanders and Lowlanders. Clan Campbell is from the Highlands. The Highlanders were the people who wore kilts and who played the Highland bagpipes. These have become symbols of all of Scotland.
This is the place from which Clan Campbell came. If you don't live there, maybe some day you can visit Scotland!