Late in life she became a social activist. After her friend Rock Hudson died, she helped establish the American Foundation for AIDS Research and helped raise money for it. In 1997, she said, “I use my fame now when I want to help a cause or other people.”

Twice she had leading roles on Broadway, in a 1981 revival of Lillian Hellman’s “Little Foxes” and two years later in Noël Coward’s “Private Lives,” with Burton, then her former husband. In the first instance she won critical respect; in the second she and Burton descended into self-parody. But theater was not her ideal arena; it was as a movie star that she made her impact.

In a life of many surprises, one of the oddest facts is that as an infant she was considered to be an ugly duckling. Elizabeth Rosemond Taylor was born in London on Feb. 27, 1932, the second child of American parents with roots in Kansas. Her father, Francis Lenn Taylor, was an art dealer who had been transferred to London from New York; her mother, the former Sara Viola Warmbrodt, had acted in the theater in New York, under the name Sara Sothern, before she was married. (Her brother, Howard, was born in 1929.) At birth, her mother said, her daughter’s “tiny face was so tightly closed it looked as if it would never unfold.”

Elizabeth spent her early childhood in England. It was there, at 3, that she learned to ride horseback, a skill that helped her win her first major role. Just before World War II, the family moved to the United States, eventually settling in Beverly Hills.

An Inauspicious Start

Ms. Taylor’s mother shared with her daughter a love of movies and encouraged her to act. Elizabeth made her movie debut in 1942 as Gloria Twine in a forgettable film called “There’s One Born Every Minute,” with Carl Switzer, best known as Alfalfa, the boy with the cowlick in the “Our Gang” series. The casting director at Universal said of her: “The kid has nothing.” Despite that inauspicious debut, Sam Marx, an MGM producer who had known the Taylors in England, arranged for their daughter to have a screen test for “Lassie Come Home.” She passed the audition. During the filming, in which Ms. Taylor acted with Roddy McDowall, a cameraman mistakenly thought her long eyelashes were fake and asked her to take them off.

The power of her attraction was evident as early as 1944, in “National Velvet.” MGM had for many years owned the film rights to the Enid Bagnold novel on which that film was based but had had difficulty finding a child actress who could speak with an English accent and ride horses. At 12, Elizabeth Taylor met those requirements, though she was initially rejected for being too short. Stories circulated that she stretched herself in order to fill the physical dimensions of the role: Velvet Brown, a girl who was obsessed with horses and rode one to victory in the Grand National Steeplechase. “I knew if it were right for me to be Velvet,” she said, “God would make me grow.”