Ordained deacon in 1802 by John Buckner, the Bishop of Chichester, and priest in 1803 by George Huntingford, the Bishop of Gloucester, D'Oyly was curate to his father for a few months in 1803, and in 1804 became curate of Wrotham in Kent. From 1806 to 1809 he was moderator in the university of Cambridge, was select preacher in 1809, 1810, and 1811, and proctor in 1808.
