Marcia Anastasia Christoforides

Marcia Anastasia "Christofor" Aitken, Baroness Beaverbrook (, formerly Lady Dunn; 27 July 1909 – 28 October 1994) was a Canadian and British Cypriot philanthropist, art collector, and racehorse owner.

Early life and family Beaverbrook was born Marcia Anastasia Christoforides on 27 July 1909 in Sutton, Surrey (present-day London) to John Christoforides (Also cited as Christoforidi.)

In 1930, Christoforides began working as a secretary for her future husband James Hamet Dunn, 1st Baronet, a Canadian financier based in London. Christoforides joined him in Sault Ste. Marie and became his assistant secretary. She had been a devoted employee and he would seek her input on most every business matter for the rest of his life. The couple maintained homes in England, France, and at the seaside resort of St. Andrews in New Brunswick, Canada, the province of her husband's birth. In the late 1940s, Lady Dunn and her husband developed a friendship with the Spanish artist Salvador Dalí who painted several portraits of them, notably Equestrian Fantasy - Portrait of Lady Dunn. These works are now on permanent display at the Beaverbrook Art Gallery in Fredericton, New Brunswick.

Following his death, on 1 January 1956, she inherited half his fortune (estimated at nearly C$70 million). Known as Christofor to her family and friends, on the death of her husband in 1956 she became the beneficiary of a large estate and also the administrator of a fund to be used for charitable purposes. One of her late husband's closest friends was his fellow New Brunswicker, Max Aitken, 1st Baron Beaverbrook who acted as her advisor. The two developed a very close friendship and Lord Beaverbrook, who had been a widower for many years, came to have great respect for her. In June 1963 the eighty-four-year-old Beaverbrook and the fifty-three-year-old Lady Dunn married.

Personal interests A devotee of show horses and equestrian events, she was also a leading race-horse owner, spending a vast amount of money on horses.