Bute

Bute, an island in the Firth of Clyde, about 16 m. long and from 3 to 5 broad, N. of Arran, nearly all the Marquis of Bute's property, with his seat at Mount Stuart, and separated from the mainland on the N. by a winding romantic arm of the sea called the “Kyles of Bute.”

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)