Marianne Croker (née Nicholson; 1791/2–1854) was an English watercolour painter and author of the 19th century.
Marianne Nicholson was the daughter of Francis Nicholson, a leading watercolourist.
Some time after 1818 she and her brother Alfred made the acquaintance of Thomas Crofton Croker, then a civil servant with antiquarian interests. The three made a number of trips to the south of Ireland to gather material for a proposed publication - Researches in the South of Ireland (1824) - to which Marianne contributed illustrations.
In Marianne, Thomas Crocker found a partner sharing the same interests and talents as he; the two made numerous visits to Ireland in support of Thomas's later publications dealing with Celtic folklore. Her extensive contributions to his work are largely unacknowledged. In 1830 Marianne and Thomas were married, later having one child, Thomas Francis Dillon Croker, also an amateur antiquary and poet.
Marianne was the author of two books, Barney Mahoney and My Village Versus Our Village - both published at her request under her husband's name. She also exhibited a number of landscape paintings.
She died on 6 October 1854, some two months after the death of her husband.
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