| John Clavell R.N. | Explanation | ||
| Father of John Clavell R.N. | |||
| Date (from) | (Date to) | Personal | |
| 1776 | Born | ||
| 5 September 1801 | Married Charlotte (1781-1853), daughter of William Bulley (-1782) | ||
| 11 March 1846 | Died (Greenwich Hospital) | ||
| Entry in O'Byrnes 1849 'Naval Biographical Dictionary' | |||
| Date | Rank | ||
| 24 June 1781 | Entered navy | ||
| 6 July 1797 | Lieutenant | ||
| 22 October 1805 | Commander | ||
| 4 February 1808 | Captain | ||
| Date from | Date to | Service | |
| 4 February 1808 | 25 March 1808 | Captain in Glatton , Palermo (until invalided home) | |
| 1 April 1811 | 29 April 1811 | Captain in Royal George![]() | |
| 13 April 1811 | 22 June 1811 | Captain in Laurestinus (22, 1806 ex Laurel) | |
| 23 June 1811 | 28 February 1819 | Captain in Orlando (36, 1811) | |
| 1 March 1819 | 22 October 1819 | Captain in Malabar | |
| 22 April 1825 | 23 March 1827 | Captain of the Ordinary, Portsmouth | |
| 22 April 1831 | 24 May 1834 | Captain of the Ordinary, Plymouth | |
| 4 July 1835 | 11 April 1837 | Captain in Astraea, Superintendent of the Packet Establishment, Falmouth | |
| 12 April 1837 | 30 June 1838 | Captain in Brune (captured from the French 1808, fifth rate), Captain-Superintendent of Chatham Dockyard | |
| 1 July 1838 | 23 August 1841 | Captain in Poictiers, Captain-Superintendent of Chatham Dockyard | |
| 24 August 1841 | 11 March 1846 | Captain, Royal Hospital Greenwich (until he died) | |
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