Denis O'Brien Aghaderry wasn't very tall!Name DENIS OBRIENDate of Death 1880Group Registration ID 6519122SR District/Reg Area CastlereaDeceased Age at Death 72 https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1880/06473/4861929.pdf
Denis junior died in 1880 but his father Denis senior died in 1855 so before civil registration. His death was reported in an Irish national newspaper -Freeman's Journal under the name of Mister D O'Brien which would indicate a person of some importance.The 1882 death was the grandson.
It must have come from somewhere.