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Sidney Royse Lysaght (1856 - 1941) (pronounced LYE-suht) was a British writer of Irish ancestry. He was born in Bristol.
In his early adulthood he worked for the family iron making concern, John Lysaght, at its factory in Bristol. He lived at Banwell Castle in Somerset. He visited Robert Louis Stevenson in Samoa, in 1894. Edward MacLysaght (1887-1986), writer and authority on Irish family history, was his son.
- A Modern Ideal (1886) poems
- The Marplot (1893)
- Her Majesty's Rebels (1907) novel
- Horizons and Landmarks (1911) poems
- My Tower in Desmond (1925)
- The Immortal Jew (1931)
- A reading of poetry; an essay (1934)