Motto.—Cavendo tutus.
[Theodocritus. Δ. Χαλκονδυλου ἐρωτηματα συνοπτικα των ὀκτω του λογου μερων μετα τινων χρησμων κανονων. Milan, 1493.]
William George Spencer Cavendish (born 21st May 1790, died 17th January 1858) was the son of William, fifth Duke of Devonshire, and succeeded to the family honours in 1811.
The Library at Chatsworth was already one of much importance, but the sixth Duke of Devonshire added to it so extensively that he is generally considered as its founder. He purchased rare books at all the great sales of his time, and removed the books which had accumulated at his other residences to Chatsworth. His collection has been further added to by successive owners.
The Duke was a Knight of the Garter, a Member of the Privy Council, Lord Lieutenant and Custos Rotulorum of Derbyshire, and High Steward of Derby. In 1821 he carried the orb at the Coronation of George IV. In 1826 he was Ambassador Extraordinary to Russia, and twice held the office of Lord Chamberlain of the Household. At the Coronation of Queen Victoria His Grace carried the Sword "Curtana," the square-tipped Sword of Mercy.
CECIL, WILLIAM, FIRST BARON BURGHLEY
Arms.—Quartered.
1 and 6. Barry of 10, arg. and az.; over all six escutcheons sa., 3, 2, and 1, each charged with a lion rampant of the first. Cecil.