Question: Of which house is this monarch usually considered the last king during whose reign a single coin had the Horndon mint?

Context paragraphs:
Unhanagara Hatthadatha of Anuradhapura: Unhanagara Hatthadatha was King of Anuradhapura in the 7th century, whose reign lasted the year 691.  He succeeded Aggabodhi IV as King of Anuradhapura and was succeeded by the first monarch from the House of Lambakanna II, Manavanna.

Horndon mint: The Horndon mint was an Anglo-Saxon mint established at Horndon-on-the-Hill in Thurrock, Essex.  It is known from a single coin of the reign of Edward the Confessor.

Edward the Confessor: Edward the Confessor (Old English: "Ēadƿeard Andettere" ] , Latin: "Eduardus Confessor" ] ; c. 1003 – 5 January 1066), also known as Saint Edward the Confessor, was among the last Anglo-Saxon kings of England.  Usually considered the last king of the House of Wessex, he ruled from 1042 to 1066.

Don Constantine: Don Constantine was the child Portuguese puppet and last titular King of Jaffna in the 17th century, whose reign lasted from 1619 to 1624.  He succeeded Cankili II.  With the conquest of the Jaffna kingdom and the end of the monarch Don Constantine was succeeded by Filipe de Oliveira, as Captain-major.

Monarch: A monarch is a sovereign head of state in a monarchy.  A monarch may exercise the highest authority and power in the state, or others may wield that power on behalf of the monarch.  Typically a monarch either personally inherits the lawful right to exercise the state's sovereign rights (often referred to as "the throne" or "the crown") or is selected by an established process from a family or cohort eligible to provide the nation's monarch.  Alternatively, an individual may become monarch by conquest, acclamation or a combination of means.  A monarch usually reigns for life or until abdication.

Austrian Silver Vienna Philharmonic: The Austrian Silver Vienna Philharmonic is a silver bullion coin produced annually by the Austrian Mint.  Beginning in 2008, it is now the highest minted and most well-known silver bullion coin from Europe.  It is sold as a mass-produced investment coin and has sold over 54 million units during a 5-year span from 2008 to 2012.  The coin is legal tender in Austria with a face value of 1.50 Euros.  It weighs exactly 1 troy ounce of .999 fine silver.  The coins are distributed from the Austrian Mint in mint cases of 500 coins each, containing 25 plastic tubes which house 20 coins each.

Newfoundland twenty-five cents: Although twenty-cent coins were required during the reign of King George V, arrangements were being made to replace the denomination.  The Ottawa Mint was going to start producing Newfoundland’s coins and Canadians did not like the Newfoundland twenty-cent piece.  Newfoundland coins circulated throughout Canada as well and the Newfoundland twenty-cent coin was often confused with Canadian twenty-five cent coins.  The Canadian government convinced Newfoundland’s government to discontinue the twenty-cent coin.  A twenty-five coin was introduced and struck on the same standard as the corresponding Canadian coin.  The obverse of the coin was exactly the same as that of the Canadian twenty-five cent coin.

Seated Liberty dollar: The Seated Liberty dollar was a dollar coin struck by the United States Mint from 1840 to 1873 and designed by its chief engraver, Christian Gobrecht.  It was the last silver coin of that denomination to be struck before passage of the Coinage Act of 1873, which temporarily ended production of the silver dollar for American commerce.  The coin's obverse is based on that of the Gobrecht dollar, which had been minted experimentally from 1836 to 1839.  However, the soaring eagle used on the reverse of the Gobrecht dollar was not used; instead, the United States Mint (Mint) used a heraldic eagle, based on a design by late Mint Chief Engraver John Reich first utilized on coins in 1807.

Nasten: Nasten was a king, who ruled perhaps in the region of Afghanistan at the beginning of the Christian era.  So far, he is only known from a single coin found in a coin hoard in Afghanistan.  On this coin he is called in a Greek inscription "Nasten, son of Xatran".  The names seems to be Iranian.  It has been suggested that he was a local, Parthian vassal king in this region.

Thraso: Thraso (Greek: Θράσων ), latinized as Thrason, was an Indo-Greek king in Central and Western Punjab, unknown until the 1982 discovery of one of his coins by R. C. Senior in the Surana hoard.  The coin is in a style similar to those of Menander I, has the same type of Athena, and shares one of Menander's mint marks.  On the coin, the title of Thraso is "Basileus Megas" ("Great King"), a title which only Eucratides the Great had dared take before him and which is seemingly misplaced on the young boy Thraso, whose single preserved coin indicates a small and insignificant reign.

Supporting paragraphs: Horndon mint Edward the Confessor
Answer: House of Wessex