Blackall was born in Limerick, the son of Henry Blackall of Garden Hill, County Limerick, and Isabella Emily Butler. His father was a solicitor and member of the Council of the Incorporated Law Society of Ireland. On his mother's side, he was a member of the Dunboyne family.[1]
In 1919, Blackall was appointed Crown Counsel in Kenya and a member of the Legislative Council in 1920.
In 1923, he was appointed Crown Counsel in Nigeria. He served in Nigeria until 1931 and acted as solicitor general for various periods. He then served as Attorney General in Cyprus from 1932 to 1936 and then in the Gold Coast from 1936 to 1943. He was made a Queen's Counsel while serving in Cyprus.[3]
Blackall retired in 1951 and pursued his interest in genealogy, writing at least two books on the subject: The Butlers of County Clare[4] and The Galweys & Gallweys of Munster.[5] In 1976 he was living in Cyprus.[6]
^Quinn, Anthony P (2006). Wigs and guns: Irish barristers in the Great War. Dublin: Four Courts Press in association with The Irish Legal History Society. p. 118. ISBN9781851829354.