Jill Angela Henriette Day-Lewis

She was an English actress of film and radio. She made her film debut in Nicholas Nickleby (1947), though she was best known for her stage, television and radio work.

The daughter of Michael Balcon and Aileen Freda Leatherman (1904–1988), she was born in Westminster, London of Baltic Jewish descent, and educated at Roedean.

In 1951, she married the Irish poet Cecil Day-Lewis. Day-Lewis was 21 years her senior and was married when they started their relationship. He was dividing his time between his mistress Rosamond Lehmann in Oxfordshire, and his wife, Mary Day-Lewis, and their two teenage sons, in Devon. Day-Lewis broke with both his wife and his mistress to be with Balcon for the remainder of his life (although he was not faithful to her during their marriage). Cecil Day-Lewis and Jill Balcon had two children: two-time Oscar-winning actor Daniel Day-Lewis and documentary filmmaker/television chef Tamasin Day-Lewis.

Balcon died of a brain tumour.

Wikipedia: http://en.wikipedia.org/wiki/Jill_Balcon