Career
A native of Coill an Bhogaigh, Gurteen, Ballinasloe, Mac Giollarnáth lived for a time in London before moving to Dublin where he taught at Saint Enda"s, Rathfarnham. From 1909 to 1916 he was editor of An Cliadheamh Soluis. He acted as a courier for the Old I.R.A. during the Irish War of Independence.
In 1923 he was appointed District Justice, which he held till he retired in 1950.
He held a lifelong interest in wildlife and folklore, which formed the basis for much of his published work. He was awarded an LL.D by the National University of Ireland in the 1960s.