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| John Welbore Sunderland Spencer R.N. | Explanation |
| Sixth son of Francis Almeric Spencer (1st Baron Churchil, 1779-1845) and grandson of George, 3rd Duke of Marlborough |
| |
| Date (from) | (Date to) | Personal |
| 12 March 1816 | | Born |
| 17 October 1888 | | Died |
| |
| Date | Rank |
| 24 December 1830 | Entered Navy |
| 23 November 1841 | Lieutenant |
| 12 October 1847 | Commander |
| 19 October 1854 | Captain |
| 1 April 1870 | Rear-Admiral |
| 20 December 1871 | Retired Rear-Admiral |
| 22 January 1877 | Retired Vice-Admiral |
| |
| Date from | Date to | Service |
| 7 December 1841 | 1845 | Lieutenant in Isis, commanded by John Marshall, Cape of Good Hope |
| 7 November 1845 | | Lieutenant in St Vincent, commanded by Richard Grant, flagship of Charles Ogle, Portsmouth |
| 9 May 1846 | December 1846 | Lieutenant in Terrible, commanded by William Ramsay, Channel squadron |
| 24 November 1846 | | Lieutenant in Victory, flag-lieutenant to Hype Parker, Admiral-superintendent of Portsmouth dockyard |
| 4 December 1849 | | Commander in Contest, East Indies |
| 7 March 1856 | | Captain in Firebrand, Black Sea |
| 11 June 1859 | 31 December 1863 | Captain in Topaze (from commissioning at Plymouth until paying off at Plymouth), Channel squadron, then (October 1859) Pacific (Commodore, senior officer on the southern division of the Pacific station) |
| 27 April 1866 | 11 June 1869 | Captain in Pembroke, Coast Guard, Harwich (replaced by Penelope) |
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