Mary Myfanwy Evans was born on 28 March 1911 into a Welsh family in London. Her father was a chemist in Hampstead, north London. She attended North London Collegiate School, whence she won a scholarship to read English Language and Literature at St Hugh's College, Oxford.
From 1935 to 1937, she edited the periodical Axis which was devoted to abstract art. She married the artist John Piper in 1937, and lived with him in rural surroundings at Fawley Bottom near Henley-on-Thames for much of her life.
Between 1954 and 1973 she collaborated with the composer Benjamin Britten on several of his operas, and between 1977 and 1981 with composer Alun Hoddinott on most of his operatic works. She was a friend of the poet John Betjeman, who wrote several poems addressing her, such as "Myfanwy" and "Myfanwy at Oxford".
Myfanwy Piper died at her home in Fawley Bottom on 18 January 1997.
- The Turn of the Screw, Benjamin Britten, 14 September 1954, Teatro La Fenice, Venice (based on the work of Henry James)
- Owen Wingrave, Benjamin Britten, 16 May 1971, BBC (based on the work of Henry James)
- Death in Venice, Benjamin Britten, 16 June 1973, Aldeburgh Festival, Snape, Suffolk (based on Der Tod in Venedig by Thomas Mann)
- Easter, Malcolm Williamson
- What the Old Man Does is Always Right, Alun Hoddinott, 1977
- The Rajah's Diamond, Alun Hoddinott, 1979
- The Trumpet Major, Alun Hoddinott, 1981
- The Seducer, Søren Kierkegaard play in two acts, based on Kierkegaard's The Seducer’s Diary, 1843
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