Naval Officer,Ship Designer/Architect

 Rear Admiral Sir William Symonds KCB, FRS. Surveyor of the Navy.2 He was born on 24 September 1782.3 He was the son of Capt. Thomas Symonds RN and Elizabeth Mallet.1 Rear Admiral Sir William Symonds KCB, FRS went to sea on 27 September 1794. Promoted lieutenant, 14 October 1801 he gained no further promotion until his captaincy on 5 December 1827. He became a retired rear-admiral in 1854.2 He married firstly Elizabeth Saunders Luscombe, daughter of Matthew Luscombe FRS, on 22 April 1808 at East Stonehouse, Plymouth, Devon.4 Rear Admiral Sir William Symonds KCB, FRS married secondly Elizabeth Mary De Carteret, daughter of Rear Admiral Philip De Carteret and Mary Rachel Silvester, on 10 March 1818 at Southampton. 1841 Census found him living at Trinity Manor Jersey Elizabeth having died in Sept of 1851 she being Lady Trinity, The marriage of Rear Admiral Sir William Symonds KCB, FRS and Susan Mary Briggs was registered in the quarter ending December 1851 in the Williton, Somerset Registration District.5 Rear Admiral Sir William Symonds KCB, FRS died on 30 March 1856 at the age of 73 on board the French steamer Nil whilst on his way from Malta to Marseilles, where he is buried.2

Refrences to Gentlemens Magazine(GM.P55) Elizabeth inherited Trinty Manor on the death of her Brother Philip on 24 August 1828 ,at Leamington
Elizabeth Mary De Carteret was born in 1774. She was the daughter of Rear Admiral Philip De Carteret and Mary Rachel Silvester. Elizabeth Mary De Carteret married Rear Admiral Sir William Symonds KCB, FRS, son of Capt. Thomas Symonds RN and Elizabeth Mallet, on 10 March 1818 in Southampton. Elizabeth Mary De Carteret died on 21 September 1851 in the Refuge, Yarmouth, Isle of Wight.1
The Refuge - OS Grid Ref. SZ 356898 - In the town of Yarmouth, a "Hospital", or Place of Refuge, was founded c.1200 by William de Vernon; Lord of the Island, between what is now the High Street and the foreshore. Originally named as the Hospital of Eremue, it later became known as "The Refuge" and was rebuilt in 1211 by Capt. David Urry. 

Citations
1. [S117] The Times Newspaper, Sep 23, 1851.
Rear Admiral Philip De Carteret
M, b. 1733, d. 1796
     Rear Admiral Philip De Carteret. The circumnavigator.1 He was born in 1733. He married Mary Rachel Silvester, daughter of Sir John Baptist Silvester. Rear Admiral Philip De Carteret died in 1796.
Children of Rear Admiral Philip De Carteret and Mary Rachel Silvester
◦ Elizabeth Mary De Carteret b. 1774, d. 21 Sep 1851
◦ Sir Philip De Carteret Bart.1 b. 1777, d. 30 Mar 1828
Citations
1. [S21] Various editors, Dictionary of National Biography, Silvester, Sir Philip Carteret. Changed his name by dee poll adding
Sir Philip De Carteret Silvester Bart.1
M, b. 1777, d. 30 March 1828
     Sir Philip De Carteret Bart. was born in 1777.1 He was the son of Rear Admiral Philip De Carteret and Mary Rachel Silvester.1 Sir Philip De Carteret Bart. died on 30 March 1828 in Leamington, Warwickshire, of apoplexy. s.n.p.1