William Angus Drogo Montagu, 9th Duke of Manchester PC (3 March 1877 – 9 February 1947), styled Lord Kimbolton from 1877 to 1890 and Viscount Mandeville from 1890 to 1892, was a British peer and Liberal politician. He served as Captain of the Yeomen of the Guard from 1905 to 1907 under Sir Henry Campbell-Bannerman.
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Early life
Manchester was born on 3 March 1877 as William Angus Drogo Montagu. He was the only legitimate son of The 8th Duke of Manchester, by his wife Consuelo Yznaga del Valle, a Cuban American heiress. His sisters were Lady Jacqueline Mary Alva Montagu and Lady Alice Eleanor Louise Montagu, who both died unmarried.
His paternal grandparents were the 7th Duke of Manchester and the former Countess Louisa von Alten. After his grandfather's death in 1890, his grandmother got remarried to The 8th Duke of Devonshire, and was referred to as the "Double Duchess". His maternal grandfather was Don Antonio Yznaga del Valle. Among his maternal relatives was aunt Naticia Yznaga (wife of Sir John Lister-Kaye, 3rd Baronet), and uncle Fernando Yznaga (husband of Jennie Smith, sister of Alva Smith Vanderbilt Belmont).
He was educated at Eton and Trinity College, Cambridge.