MARRIED. Donny Osmond, 20, third youngest of the seven singing Osmonds and TV co-star with sister Marie; and Debra Glenn, 19, a Brigham Young University freshman, who met Donny on a double date; in Salt Lake City's Mormon temple.

SEEKING DIVORCE. Princess Margaret of Britain, 47; from Antony Armstrong-Jones, 48, a photographer named as Earl of Snowdon after the wedding; after 18 years of marriage, two children (see WORLD).

DIED. Lengina Shevchenko, 48, wife of Soviet Diplomat Arkadi Shevchenko, who last month defected from the U.S.S.R. and resigned his Manhattan post as an Under Secretary-General of the United Nations; of an overdose of pills; in Moscow.

DIED. Aldo Moro, 61, leader of Italy's Christian Democratic Party and the man who was most likely to become the country's next President; of gunshot wounds inflicted by terrorists (see WORLD).

DIED. Sylvia Townsend Warner, 84. English novelist and short-story writer who probed the small conceits of her humdrum characters with a tartly satirical eye; in Maiden Newton, England. Warner met success early when her first novel (Lolly Willowes) became a premier selection by the fledgling U.S. Book-of-the-Month Club in 1926, but she showed an enduring talent with her genteel, Victorian prose (The Museum of Cheats, The Flint Anchor). A longtime contributor to The New Yorker, she also won acclaim as a poet (Time Importuned), a translator (Marcel Proust on Art and Literature 1896-1919) and a biographer (T.H. White).

DIED. Raymond Rubicam, 85. enterprising co-founder and former chairman of Young & Rubicam, the nation's largest ad agency; in Scottsdale. Ariz. Kept waiting nine days in the outer office of a Philadelphia firm where he looked for his first advertising job, Rubicam wrote a scathing letter that launched his career. Always a forceful writer, he ceaselessly sought fresh, strong ad copy when he formed his own agency with John Orr Young. He also introduced to advertising the concept of market research when he hired a then unknown George Gallup to conduct consumer polls.

DIED. Duncan Grant, 93. the last survivor and "court painter" of the celebrated Bloomsbury group of London-based intellectuals, which included Virginia Woolf and John Maynard Keynes; in Aldermaston, England. Greatly in demand as a decorator. Grant also designed for the stage and was a postimpressionist painter of some renown.

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