The engagement was announced 23 December, 2006, between William Cavendish, styled Earl of Burlington (b. 6 June 1969), only son and heir of the 12th Duke of Devonshire (b. 27 Apr 1944), of Chatsworth House, Derbyshire, by his wife, the former Amanda Carmen Heywood-Lonsdale (b. 1944), & Mrs Laura Ann Montagu (b. 1972), former wife of the Hon Orlando William Montagu (b. 1971), (yr son of the 11th Earl of Sandwich) & only daughter of Richard Charles Roundell (b. 11 Feb 1944), head of the LG family of Dorfold Hall, Nantwich, Cheshire, descended from the Earls of Dysart, by his wife the former Anthea Frances Legge (b. 15 May,1946), scion of the Earls of Dartmouth, and granddaughter paternally of Charles Wilbraham Roundell (b. 15 July 1912; d. 3 Aug 2003), by his wife the former Anne Moore (d. 2005); and great-granddaughter of Christopher Foulis Roundell (1876-1959), by his wife, the former Lady Maude Clements (1877-1932), daughter of the 4th Earl of Leitrim (1847-92), by his wife the former Lady Winifred Coke (d. 1940), daughter of the 2nd Earl of Leicester (1822-1909), &c.. Laura is a granddaughter maternally of David Alexander Keppel Legge, CBE (b. 1916), by his wife the former Patria Hornung, dau of Lt-Col. C.B.R. Hornung, DL, JP.