Question: Which owner of the Villa La Leopolda was named to the International Best Dressed List Hall of Fame in 1963?

Context paragraphs:
Gloria Guinness: Gloria Guinness (born Gloria Rubio Alatorre; August 27, 1913 – November 9, 1980) was a socialite and fashion icon, as well as a contributing editor to "Harper's Bazaar" from 1963-71.  She was named to the International Best Dressed List Hall of Fame in 1964.

Jane Engelhard: Jane Engelhard (August 12, 1917 – February 29, 2004), born Marie Antoinette Jeanne Reiss, was an American philanthropist, best known for her marriage to billionaire industrialist Charles W. Engelhard Jr., as well as her donation of an elaborate 18th-century Neapolitan crêche to the White House in 1967.  She was named to the International Best Dressed List Hall of Fame in 1972.

Françoise de Langlade: Françoise de Langlade (1921-1983) was a magazine editor with Conde Nast Publications and the wife of fashion designer Oscar de la Renta.  She was named to the International Best Dressed List Hall of Fame in 1973.

Inès de La Fressange: Inès Marie Lætitia Églantine Isabelle de Seignard de La Fressange, born 11 August 1957, is a French model, aristocrat, style icon, fashion designer and perfumer.  She was named to the International Best Dressed List Hall of Fame in 1998.

Mona von Bismarck: Mona von Bismarck (February 5, 1897 – July 10, 1983), known as Mona Bismarck, was an American socialite, fashion icon, and famed beauty.  Her five husbands included Harrison Williams, said to be the richest man in America, and the Graf von Bismarck-Schönhausen, grandson of German Chancellor Otto von Bismarck.  Mona was the first American to be named "The Best Dressed Woman in the World" by a panel of top couturiers including Chanel, and was also named to the International Best Dressed List Hall of Fame.

C. Z. Guest: Lucy Douglas "C. Z." Guest ("née" Cochrane; February 19, 1920 - November 8, 2003) was an American stage actress, author, columnist, horsewoman, fashion designer, and socialite who achieved a degree of fame as a fashion icon.  She was frequently seen wearing elegant designs by famous designers like Mainbocher.  Her unfussy, clean-cut style was seen as typically American, and she was named to the International Best Dressed List Hall of Fame in 1959.

Annette de la Renta: Annette de la Renta (born 24 December 1939) is an American philanthropist and socialite, the widow of the Dominican fashion designer Oscar de la Renta.  She was named to the International Best Dressed List Hall of Fame in 1973.

Villa Leopolda: The Villa La Leopolda is a large detached villa in Villefranche-sur-Mer, in the Alpes-Maritimes department on the French Riviera.  The villa is situated in 18 acres of grounds.  The villa has had several notable owners including Gianni and Marella Agnelli, Izaak and Dorothy J. Killam, and, since 1987, by Edmond (1932–1999) and Lily Safra, who inherited the villa after her husband's death.

Marella Agnelli: Marella Agnelli, born Donna Marella Caracciolo di Castagneto (born 4 May 1927) is an Italian noblewoman, art collector, socialite, style icon and widow of former Fiat chairman Gianni Agnelli.  She has often appeared in the fashion magazine "Vogue."  She was named to the International Best Dressed List Hall of Fame in 1963.

Lee Radziwill: Caroline Lee Radziwill ("née" Bouvier, formally Bouvier-Canfield; born March 3, 1933) is an American socialite, public relations executive, interior decorator, and former actress.  She is the younger sister of the late First Lady, Jacqueline Onassis, and sister-in-law of President John F. Kennedy.  Her niece Caroline Bouvier Kennedy is named after her.  Radziwill was named to the International Best Dressed List Hall of Fame in 1996.  Married and divorced three times, her marriage to her third husband, Herbert Ross, ended in divorce shortly before his death in 2001.

Supporting paragraphs: Villa Leopolda Marella Agnelli
Answer: Marella Agnelli