The novel was based on the true story of Ellen Scanlan (née Hanley), a fifteen-year-old girl who was murdered on 14 July 1819.
WIkipedia: The Colleen Bawn.
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Ekaterina Filippovna Tatarinova (nee Buxhöwden)—1783-1856—founded in Petersburg, in 1817, a mystical sect, the “Spiritual Union” in which, besides faith healing and divination, they adopted the practice, borrowed from the Skoptsi, of inducing ecstasy and a spirit of prophecy by violent whirling dances.