paul walsh's first work concerning ulster was his edition of the diary of tadhg ó cianáin, which was a journal of the flight of the earls. this edition was published in 1916. it was followed by "genealogie regum et sanctorum hiberniae" in 1918, a previously unpublished collection of genealogies of kings and saints by the four masters. further such studies included "the will and family of hugh o'neill" (1919; published in book form in 1930); "the life of aodh ruadh ó domhnaill" (1922); "the book of o'donell's daughter" (1929); and "colonel myles o'reilly, sheriff of county cavan, 1641" (1935). 1920 saw the publication of "leabhar chlainne suibhne: an account of the mac sweeney families in ireland, with pedigrees". the dedication was " nollaig ó muraíle describes it as "an important, well thought-out book, a work which no-one working on donegal history can afford to ignore" (#3). unfinished at his death was his edition of "beatha aodh ruadh ó domhnaill" by lughaidh ó cléirigh. however, this led to a "series of meticulous and penetrating studies that were to shed a great deal of light on the story of mícheál ó cléirigh and the four masters" (#4), all of which were published in the 1930s and are still invaluable.