Rob Roy was a legendary cateran -  A Highland marauder or irregular fighting man {i} - and the eponymous hero of the novel by Walter Scott published in 1817 {ii}

References:
{i} Dictionary of the Scots Language - accessed 12Oct2019
{ii}  http://www.walterscott.lib.ed.ac.uk/works/novels/robroy.html - accessed 12Oct2019

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