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Maddenstown House was home to Captain William Kelly, horse racing enthusiast and patron of prize fighter Dan Donnelly.
Johnstone also heads the popular all-star musical festival act,"The Fabulous Good Time Party Boys", which features members of the Levellers, Irish singer/songwriter Dan Donnelly, American musician Roy Harter, and two of his children, Alex Johnstone and Emily Johnstone.
At a natural bowl-shaped amphitheatre on the Curragh known locally as Donnelly's Hollow the Irish champion boxer Dan Donnelly defeated the English champion George Cooper in 1815, before a large crowd.