Born. To Mia Farrow, 25, saucer-eyed cinema actress (most recently in John and Mary), and Andre Previn, 40, composer-conductor about town, currently leading the London Symphony Orchestra: their first children, twin boys; in London. Previn says that they plan to marry as soon as he is divorced from his estranged wife; Mia Divorced Frank Sinatra in August 1968.

Married. Birendra Bir Bikram Shah Deva, 24, Crown Prince of Nepal (seeThe World).

Married. Jason Robards, 47, Broadway leading man (most recently starred in We Bombed in New Haven); and Lois O'Connor, 26, onetime TV production assistant; he for the fourth time (his eight-year marriage to Lauren Bacall ended in divorce last September), she for the first; in a civil ceremony in Malibu, Calif.

Died. Marie Dionne, 35, one of Canada's four surviving quintuplets; in Montreal. Displayed with her sisters in a fenced yard until she was two and bothered by publicity all her youth, Marie sought privacy in a convent, only to be forced out by poor health; she married at 24, was separated in 1964, and was living alone in Montreal when she died.

Died. Mark Rothko, 66, Russian-born master of Abstract Expressionism, whose monumental canvases, aglow with rectangles of floating color, were exquisite in their simplicity; by his own hand (slashed wrists); in his Manhattan studio. The son of an immigrant Russian pharmacist, Rothko developed his talent with virtually no formal training, progressing from realism through Surrealism to his own version of abstractionism. Line, subject, perspective--all were gone. "You have nothing here but content," he once said, in describing his style of running colors together to produce the impression of shimmering motion from an almost totally static form. Recognition was long in coming, but it arrived with a rush in the late '50s; in 1961 Rothko was honored with a retrospective at the Museum of Modern Art. Last year he was stricken by a heart attack, which, said friends, left him ever more despondent.

Died. Conrad Nagel, 72, veteran of Hollywood and Broadway; of a heart attack; in Manhattan. After making his debut on Broadway in 1918's Forever After, the handsome blond actor rose to stardom in the silent days, appearing in more than 150 films (Little Women, The Jazz Singer) between 1919 and 1932. His resonant baritone was perfect for talkies, and he continued to star in films while scoring Broadway hits in 1943's The Skin of Our Teeth and 1948's Goodbye, My Fancy.

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