Question: Admiral Sir William Richard Scott Thomas was the Gentleman Usher of the Black Rod from 1992 to 1995, a position which originates where?

Context paragraphs:
Edward Jones (British Army officer): General Sir Charles Edward Webb Jones (25 September 1936 – 14 May 2007) was a senior officer in the British Army.  He served as Quartermaster-General and as Britain's military representative to the North Atlantic Treaty Organisation (NATO).  He retired from the Army in 1995 to become Gentleman Usher of the Black Rod (or simply Black Rod) in the British Parliament's House of Lords, serving in that office until 2001.

Black Rod: The Gentleman Usher of the Black Rod, generally shortened to Black Rod, is an official in the parliaments of several Commonwealth countries.  The position originates in the House of Lords of the Parliament of the United Kingdom.

Richard Thomas (Royal Navy officer): Admiral Sir William Richard Scott Thomas (22 March 1932 – 13 December 1998) was the Gentleman Usher of the Black Rod (or simply Black Rod) in the British Parliament's House of Lords from January 1992 to 8 May 1995.

Freddie Viggers: Sir Frederick Richard "Freddie" Viggers {'1': ", '2': ", '3': ", '4': "} (born 29 June 1951) is a former senior British Army officer, who served as Adjutant-General to the Forces immediately prior to his retirement in 2008.  He served as Gentleman Usher of the Black Rod from 30 April 2009 to 28 October 2010.  He also served in Bosnia in the aftermath of the breakup of Yugoslavia, and in the Iraq War.

Augustus Clifford: Admiral Sir Augustus William James Clifford, 1st Baronet, {'1': ", '2': ", '3': ", '4': "} (26 May 1788 – 8 February 1877) was a British Royal Navy officer, court official, and usher of the Black Rod.

David Leakey: Lieutenant General Arundell David Leakey, {'1': ", '2': ", '3': ", '4': "} (born 18 May 1952) is a former British military commander.  He was Director General of the European Union Military Staff in the Council of the European Union, Brussels.  In 2010 he was appointed Gentleman Usher of the Black Rod.

Sir Francis Molyneux, 7th Baronet: Sir Francis Molyneux, 7th Baronet (1738–1812) was a courtier who became Gentleman Usher of the Black Rod.

Michael Willcocks: Lieutenant General Sir Michael Alan Willcocks, (born 27 July 1944) is a retired officer of the British Army and former Gentleman Usher of the Black Rod for the Parliament of the United Kingdom's House of Lords.

Septimus Robinson: Lieutenant-Colonel Sir Septimus Robinson (30 January 1710 – 6 September 1765) was a British Army officer who became Gentleman Usher of the Black Rod.

Gentleman Usher of the Green Rod: The Gentleman Usher of the Green Rod is the Gentleman Usher to the Most Ancient and Most Noble Order of the Thistle, established in 1687.

Supporting paragraphs: Richard Thomas (Royal Navy officer) Black Rod
Answer: House of Lords of the Parliament of the United Kingdom.