Born. To Sekou Toure, 39, neutralist, left-leaning President of Guinea, and Andree Toure. 30, his second wife: their first child, a son; in Conakry.

Married. Mary Clark Rockefeller, 22, daughter of New York Governor Nelson Rockefeller, great-granddaughter of the original John D.; and William Justice Strawbridge Jr.. 24, descendant of one of Philadelphia's first families (Strawbridge & Clothier department store), now on active duty as an ensign in the U.S. Naval Reserve; in New York City.

Married. Sir Laurence Olivier, 53; and Joan Plowright, 31, dark-eyed English actress; he for the third time, she for the second; in Wilton, Conn.

Married. James Ramsey Ullman, 53, bestselling author-adventurer whose novels explored the tops of mountains (The White Tower) and the depths of jungles (River of the Sun); and Marian B. McCown, 48, a fund-raising publicist; he for the third time, she for the second; in New York City.

Marriage Revealed. Pablo Picasso, 79; and Jacqueline Roque, 35, his model; both for the second time; in Vallauris on the French Riviera, March 2 (see ART).

Divorced. Roger Vadim (real name: Roger Vadim Plemiannikov), 33, French film writer-producer who revealed the natural gifts of his first wife, Brigitte Bardot, to the world; and Danish Cinemactress Annette Stroyberg. 24; after 2 1/2 years of marriage, one child, and one film (Dangerous Affairs) that was barred from export by the French government because of salaciousness; in Paris. Grounds: "Mutual insults and faults."

Died. Ruth Fischer, 62, German Communist hoyden in the pre-Nazi Reichstag, who was expelled from the party in 1926, fled to France and then to the U.S., and who in 1947 denounced her brother, Ger-hart Eisler, as a top Kremlin agent in the U.S. and in 1948 wrote the scholarly anti-Communist Stalin and German Communism ; of a heart attack; in Paris.

Died. Isaac Frederick Marcosson, 83, tireless, traveling journalist, who scarcely missed a world maker or a world shaker while logging more than 250,000 miles from 1907 to 1936 as correspondent for the Saturday Evening Post; of a stroke; in New York City. Marcosson wrote some 30 books, including David Graham Phillips and His Times, a 1932 biography of the muckraking reporter who was shot down in 1911 while strolling in Manhattan's Gramercy Park by a crazed violinist who imagined that Phillips had defamed his sister in print. Marcosson was a friend of Phillips and the "tried and loyal friend" of Phillips' sister, who in 1932 left the author $729,286 in her will.

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