- While touring Australia and New Zealand in the acclaimed stage play "Peg o' My Heart", she married her leading man, Gerald Henson, in Melbourne in September of 1916. She gave birth to a daughter who lived only one hour, a victim of the influenza epidemic that raged through Melbourne. Her husband also died of the illness shortly afterward.
- After the death of her father she was raised in a Dublin orphanage. She later apprenticed as an upholsterer, which was her father's profession.
- Daughter died of influenza in 1917.
- She became a U.S. citizen in 1945.
- Her sister Molly Allgood, stage name Maire O'Neill, was also a famous actress. A brother, Frank Allgood, died fighting with the British Army during World War I on the Western Front.
- While performing in Australia, she had a highly unsatisfactory experience in her debut film, Just Peggy (1918). It was 11 years before she attempted another, with Alfred Hitchcock's Blackmail (1929).
- Was first enrolled in the National Theatre Society and within a few years became one of Ireland's top theatre actresses.
- Older sister of Irish actress Maire O'Neill.
- Profiled in "Actresses of a Certain Character" by Nils Axel Nissen.
- She has appeared in one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: How Green Was My Valley (1941).
- Father: George Allgood; Mother: Margaret Harold.
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