Baron Sydney was a title that was created thrice in British history. The first creation came in the Peerage of England in 1603 when Robert Sydney was made Baron Sydney, of Penshurst. He was later created Earl of Leicester. For more information on this creation, see this title. The second creation came in 1768 when Dudley Cosby, Minister Plenipotentiary to Denmark between 1763 and 1765, was made Baron Sydney, of Stradbally in the Queen's County, in the Peerage of Ireland. He was the grandson and namesake of Dudley Cosby, who represented the Queen's County in the Irish House of Commons, and the great-nephew of William Cosby. This creation became extinct on Lord Sydney's death in 1774. The third creation came in 1783 when Thomas Townshend was created Baron Sydney, of Chiselhurst in the County of Kent. He was later created Viscount Sydney and his grandson was made Earl Sydney in 1874. For more information on this creation, see the latter title.
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