In 1817, on the death of his father, he succeeded to the Dukedom of Marlborough, and in the same year he assumed by Royal Licence the surname and arms of Churchill in addition to his patronymic of Spencer. This was done in memory of the first Duke of Marlborough, who left no male heir, but whose second daughter Anne had married Charles Spencer, third Earl of Sunderland, and their son Charles, fifth Earl of Sunderland, succeeded his aunt Henrietta, _suo jure_ Duchess of Marlborough, in the Dukedom in 1733. While Marquis of Blandford the Duke collected a magnificent library at his house, White Knights, near Reading, but extravagance in living compelled him to part with it by auction in 1819. [Illustration] COCHRANE, JOHN, FOURTH EARL OF DUNDONALD _Arms._--Impaled. Dexter: Arg., a chevron gu., between 3 boars' heads erased arg. _Cochrane._ Sinister: Az., 3 mullets arg., within a double tressure flory counterflory or. _Murray._ _Coronet._--That of an Earl. [SETTLE. _Virtute Sacellum._ London, 1720.] John Cochrane (born 1660 (?), died 5th June 1720) was the second son of John, second Earl of Dundonald, and succeeded his brother William in the Earldom in 1705. In 1706 he married Anne, daughter of Charles Murray, Earl of Dunmore. Lord Dundonald was a Representative Peer of Scotland and Colonel of the 4th Regiment of Horse Guards. [Illustration] COCKS, JOHN, BARON SOMERS _Crest._--On a mount vert, a stag lodged reguardant arg., attired sa., and gorged with a chaplet of laurel leaves vert. _Cocks._ _Coronet._--That of a Baron. [_Common Prayer._ London, 1669.] John Somers Cocks (born 6th May 1760, died circ. 1841) was the son of Charles Cocks, Baron Somers, and was educated at Oxford. He was successively Member of Parliament for West Looe, for Grampound, and for Reigate. In 1806 he succeeded to his father's barony, and in 1821 was created Earl Somers. Lord Somers married as his second wife, Jane, daughter of his Uncle James, and widow of the Rev. George Waddington. [Illustration] COKE, THOMAS, FIRST EARL OF LEICESTER _Arms._--Impaled. Dexter: Per pale, gu. and az., 3 eagles displayed or. _Coke._ Sinister: Sa., an eagle displayed erm. _Tufton._ _Crest._--On a chapeau az., turned up erm., an ostrich arg., holding in its mouth a horseshoe or. _Helmet._--That of an Esquire. _Motto._--PRUDENS QUI PATIENS. [MORGUES. _Diverses Pièces pour la Defense de la Royne Mère du Roy Louys XIII._ Paris, 1637.]