Legge was the third son of William Legge, 4th Earl of Dartmouth, by his second wife Frances, daughter of George Barrington, 5th Viscount Barrington. William Legge, 5th Earl of Dartmouth, was his half-brother and Colonel Heneage Legge his full brother. He was educated at Eton and Christ Church, Oxford. Ordained in 1864, he was Domestic Chaplain to Anthony Thorold, Bishop of Rochester then Vicar of St Bartholomew’s, Sydenham  and after that Rural Dean of Lewisham before his elevation to the Episcopate in 1891. From 1873 to 1876 he was a member of the London School Board, representing the Greenwich Division.
Legge married Fanny Louisa, daughter of William Bruce Stopford Sackville, in 1877. They had several children. Fanny died in December 1911. Legge survived her by two years and died in March 1913, aged 73.
- “Who was Who” 1897-1990 London, A & C Black, 1991 ISBN 0-7136-3457-X
- The Times, Friday, 21 March 1913; p. 7; Issue 40165; col B Deaths
- Two New Bishops Nominated Birmingham And Lichfield The Times Friday, Jun 19, 1953; pg. 8; Issue 52652; col D
- thepeerage.com Rt. Rev. Hon. Augustus Legge
- Sydenham Society
- "The Clergy List, Clerical Guide and Ecclesiastical Directory" London, Hamilton & Co 1889
- "The London School Board Elections". Daily News. 29 November 1873.
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