Richard FitzWilliam, 6th Viscount FitzWilliam Irish peer (1711-1776) (1711–1776) Parents Richard FitzWilliam, 5th Viscount FitzWilliam Frances Shelley Children Richard FitzWilliam, 7th Viscount FitzWilliam John FitzWilliam, 8th Viscount FitzWilliam Siblings John Fitzwilliam Frances FitzWilliam Mary FitzWilliam Partners Catherine Decker
