Sidney Montagu, 11th Duke of Manchester

He married firstly on 5 February 1955 Adrienne Valerie Christie (d. 1988), daughter of Commander John Kenneth Christie, Ambassador of South Africa in Kenya; later Karawater farmer, near Ruigtevlei, Cape Town, South Africa. They divorced in 1978. He married secondly on 25 August 1978 Andrea Joss, daughter of Cecil Alexander Joss of Johannesburg, South Africa (d. 21 January 1996), who had previously been married twice, to Major S. Whitehead and to G. J. W. Kent. He had no children from either marriage.^{[citation needed]}

In 1983, the Duke sued his stepmother, Elizabeth, who he believed had possession of several family heirlooms that he felt were rightfully his.^[1]

The Duke died suddenly at Robin Hood Ranch, Tennessee, United States, on 3 June 1985.^[2] His funeral took place on 13 June and he is buried at Kimbolton Parish Church.^[3]

Sidney inherited the dukedom upon his father's (Alexander Montagu) death in 1977. He held this title for eight years, until his own death in 1985. As he died childless, he was succeeded by his brother Angus Montagu, who became the 12th Duke of Manchester and he is the father of the current duke, Alexander Charles David Drogo Montagu, the 13th Duke of Manchester.^{[citation needed]}

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  The Duke in 1981, by Allan Warren
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  His second wife Andrea in 1982, by Allan Warren