Day was born into an ecclesiastical family; his father was Maurice Day, later Bishop of Clogher. Educated at Oakham School and Pembroke College, Cambridge (whence he gained his Cambridge Master of Arts (MA Cantab)), he was ordained in 1897. He was a Missionary for the Cambridge Mission to Delhi until 1909 when he became Vicar of St Ann’s Church, Dublin (1913–21). He became Bishop of Ossory, Ferns and Leighlin in 1920, holding the post for 18 years. In 1938 he was elected Archbishop of Armagh but died within two months of taking office, having at some point become a Doctor of Divinity (DD).
- genealogical web site
- Who was Who 1897-1990 London, A & C Black, 1991 ISBN 0-7136-3457-X
- "Day, John Godfrey Fitzmaurice (DY893JG)". A Cambridge Alumni Database. University of Cambridge.
- Ordinations. Worcester The Times Wednesday, Dec 22, 1897; pg. 3; Issue 35393; col C
- ”The Clergy List” London, John Phillips, 1900
- Dublin Heritage and S.G. Poyntz, St. Ann's: the church in the heart of the city (Dublin, 1976), p. 98.
- New Irish Bishop The Times Wednesday, Jun 16, 1920; pg. 18; Issue 42438; col F
- The Times, Friday, Jun 10, 1938; pg. 14; Issue 48017; col B New Archbishop of Armagh enthroned
- The Times, Tuesday, Sep 27, 1938; pg. 14; Issue 48110; col C The Archbishop Of Armagh Primate Of All Ireland
|Bishop of Ossory, Ferns and Leighlin
June 1920 – June 1938
|Archbishop of Armagh
June 1938 – September 1938
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