Source: Sydenham was born in Reading, the eldest of three children. Aged 17, he was a pupil of the Reverend Edward Ebenezer Crake, rector of
Jevington in Sussex. He went on to
Merton College, followed by
Wells Theological College. His career with the church included: curate, St Mary's, Oldham; ordained as deacon in
Manchester Cathedral (19 Dec 1897); St Matthew's church, Nottingham (1905); Christ Church, Ealing (1907); vicar of
Wolvercote, Oxford (1909); the parish of
West Molesey (1927). He retired in 1942. After retirement, the family moved to Ivy House,
Cowes, Isle of Wight, where he continued his interest in history and numismatics. He was an assistant curator at the
Carisbrooke Castle Museum. He continued his ministry by providing assistance at
St Mary's church, Cowes. Sydenham was buried in Cowes. Sydenham married twice. He married Ada Lilian Stone on 21 November 1911, their son Eldred St Barbe was born in October 1912. Ada died of peritonitis, aged 20, in 1914. He married Althea Josephine ((known as Jo) Walker in June 1919; their son Michael Wyndham was born in June 1920. Sydenham was also a numismatist, and author of works on Roman Republican and Imperial coinage. He was president of the
Royal Numismatic Society from 1937 to 1942. He died in the spring of 1948 and is buried in Cowes. == Selected publications ==