Baron Windlesham is a title in the Peerage of the United Kingdom. It was created in 1937. In 1999, the third Baron Windlesham was created a life peer as Baron Hennesy so that he could continue to sit in the House of Lords despite the passage of the House of Lords Act 1999, which removed the automatic right of hereditary peers to a seat in Parliament.
Sir David James George Hennessy, 3rd BaronWindlesham, Bt, CVO, PC (born 28 January 1932) is a Conservative politician in the United Kingdom, and currently holds visiting professorships at various universities.
He joined the Westminster City Council in 1958, then held various positions before entering the House of Lords as the 3rd BaronWindlesham upon his father's death in 1968.
In 1999, he was created Baron Hennesy (with one s) after the House of Lords Act 1999, so that he could continue sitting in the Lords.