Autograph Letter Signed “Very Affectionately Yours, Mary Adelaide”, to Lady Barrington, sending congratulations and wishing “happiness to your dear Child”, hoping soon to meet her correspondent’s future son-in-law. 3 pp. 6 x 4 inches, in good condition, second leaf laid down on part album page. Embossed monogram in blue. Kensington Palace, 29 May 1868. Princess Mary Adelaide (1833-97), Duchess of Teck, mother of Queen Mary, consort of George V. Mary Adelaide was the youngest of the three children of the seventh son of George III, Adolphus Frederick, Duke of Cambridge (1774–1850), and his wife, Princess Augusta (1797–1889).