He was a grandson of John D'Arcy of Hydepark, County Westmeath, and a descendant of The 1st Baron Darcy de Knayth, one of the knights who had fought at the Battle of Crecy (1346).

[3] In August 1919, D'Arcy was appointed Archbishop of Dublin, Bishop of Glendalough and Kildare and Primate of Ireland.

[5] Less than a year later, in June 1920, he was elected as Archbishop of Armagh and Primate of All Ireland, again succeeding Crozier.

[7] In 1921 he was appointed a member of the Senate of Southern Ireland, which was abolished with the establishment of the Irish Free State in 1922, but did not attend.

[10] In 1934 he published his autobiography, The Adventures of a Bishop: a Phase in Irish Life, and in June 1937 announced that he intended to retire because of poor health.

[2] Their son, John Conyers D'Arcy, Royal Artillery, fought in both World Wars and ended his career as the Commander of British forces in Palestine and Transjordan.

[2][12] In May 1920, D'Arcy gave his son a special licence to marry Noël Patricia Wakefield.