Trelawney was the son of Jonathan Trelawny, gentleman of St Germans, Cornwall, and a descendent of Sir Jonathan Trelawny, MP of Trelawne (died 1604) who left the Coldrenick estate to his second son Edward. He matriculated at Trinity College, Oxford on 7 April, 1671, aged 18. He was awarded B.A. from Christ Church, Oxford in 1674 and awarded M.A. in 1677.
Trelawney was appointed rector of St Tudy in 1677, and of South Hill, Cornwall, in 1691. He became a Canon in 1699 and sub-dean of Exeter in 1705. In 1717 he became Dean of Exeter and Archdeacon of Exeter and remained in post until his death on 21 or 24 October 1726.
- Ursula Radford (1955). "An Introduction to the Deans of Exeter". Report & Transactions of the Devonshire Association 87: 1–24.
- Foster, Joseph. "Tracie-Tyson in Alumni Oxonienses 1500-1714 pp. 1501-1528". British History Online. Retrieved 12 April 2019.
- "TRELAWNY, Darell (1695-1727), of Coldrenick, nr. Liskeard, Cornw". History of Parliament Online. Retrieved 12 April 2019.
|Church of England titles|
| Dean of Exeter
| Archdeacon of Exeter
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