He was the second son of William Markham, Archbishop of York from 1776 to 1807, and educated at Westminster School. He married Elizabeth Evelyn, daughter of Sir Richard Sutton, of Norwood in 1789: the marriage was to end in divorce in 1803. He was Rector of Tattenhall  then Prebendary of Bilton before becoming dean.
|Church of England titles|
|Dean of York
- LEEDS. SATURDAY, OCT. 5 Leeds Mercury (Leeds, England), Saturday, October 5, 1822; Issue 2991
- Tweddell History
- Tuesday's Post Continued Jackson's Oxford Journal (Oxford, England), Saturday, March 27, 1802; Issue 2552
- National Church Institutions Database of Manuscripts and Archives
- Nigel Aston, ‘Markham, William (bap. 1719, d. 1807)’, Oxford Dictionary of National Biography, Oxford University Press, 2004 [http://www.oxforddnb.com/view/article/18071, accessed 22 Aug 2012
- Irish Statue Book 1803 (43 Geo. 3) c. 76P
- “The parliamentary register; or, History of the proceedings and debates of the Great Britain. Parliament” Almon,J: London, Debrett’s , 1804
- House Of Lords, Wednesday, March 30. The Times (London, England), Thursday, Mar 31, 1803; pg. 2; Issue 5674
- Ecclesiastical intelligence The Times(London, England), Thursday, Aug 23, 1787; pg. 2; Issue 831.
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