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I was unable to locate the marriage record in Co. Roscommon even though the marriage was around 1885 according to the 1911 census. Possibly you have the record. I could not find a death record for either Bartholomew or Elizabeth on www.irishgenealogy.ie
I found some background from 1837 on Tonroe or Feenagh and Tonroe and Creen. Usually when you have two names, it was just a way for the locals to distinguish two townlands e.g Upper or Lower, More or Beg, North or South etc