Question: Who was the youngest son of Erik Thorvaldsson?
Context: Viscount Boyne, in the province of Leinster, is a title in the Peerage of Ireland.  It was created in 1717 for the Scottish military commander Gustavus Hamilton, 1st Baron Hamilton of Stackallan.  He had already been created Baron Hamilton of Stackallan, in the County of Meath in 1715, also in the Peerage of Ireland.  Hamilton was the youngest son of Sir Frederick Hamilton, youngest son of Claud Hamilton, 1st Lord Paisley (from whom the Dukes of Abercorn descend), third son of James Hamilton, 2nd Earl of Arran (from whom the Dukes of Hamilton descend).  His grandson, the second Viscount, represented Newport (Isle of Wight) in the House of Commons.  His first cousin, the fourth Viscount, sat as a member of the Irish House of Commons for Navan.  His great-grandson, the seventh Viscount, assumed in 1850 the additional surname of Russell (which was that of his father-in-law).  In 1866, he was created Baron Brancepeth, of Brancepeth in the County of Durham, in the Peerage of the United Kingdom.  Prior to the passing of the House of Lords Act 1999, the Viscounts Boyne sat in the House of Lords in right of this title.  s of 2010 the titles are held by the seventh Viscount's great-great-great-grandson, the eleventh Viscount, who succeeded his father in 1995. Baron Wrottesley, of Wrottesley in the County of Stafford, is a title in the Peerage of the United Kingdom.  It was created in 1838 for Sir John Wrottesley, 9th Baronet.  He was a Major-General in the Army and also represented Lichfield, Staffordshire and Staffordshire South in House of Commons.  He was succeeded by his son, the second Baron.  He was President of the Royal Astronomical Society as well as of the Royal Society.  His son, the third Baron, held junior positions in the first two Liberal administrations of William Ewart Gladstone.  He was succeeded by his eldest son, the fourth Baron.  On his death in 1962 the titles passed to his nephew, the fifth Baron who was the only son of the Hon. Walter Bennet Wrottesley, youngest son of the third Baron.In 1963 he sold the Staffordshire estate.  s of 2010 the titles are held by the fifth Baron's grandson, the sixth Baron, who succeeded in 1977.  He is the only son of the Hon. Richard Francis Gerard Wrottesley, second son of the fifth Baron. Abdullah I bin Sabah Al-Sabah (Abdullah I; 1740 – 3 May 1814) was the second ruler of Kuwait, ruling from 1763 to 3 May 1814.  He was the youngest son of Sabah bin Jaber, upon whose death he succeeded.  He was elected to the position by chiefs and notables despite his standing as the youngest son.  He is also the father of Jaber I Al-Sabah who succeeded him. Prince Erik, Duke of Västmanland (Erik Gustav Ludvig Albert; 20 April 1889 – 20 September 1918) was a Swedish and Norwegian prince.  He was the third and youngest son of King Gustav V of Sweden and Victoria of Baden.  In 1904, Prince Erik was appointed a Knight of the Norwegian Lion by his paternal grandfather, King Oscar II. Romapada or Chitraratha was the youngest son King Vidarbha of Yadava and an adopted son of King Dharmaratha of Anga.  King Vidarbha had many sons but his friend King Dharmaratha had no son and so King Dharmaratha adopted his friend King Vidarbha's youngest son Romapada.  When King Vidarbha became old made Vidarbha Kingdom and made Kratha as the next Yadava ruler and made his second son Bhima as the ruler of Vidarbha and went to forest.  King Dharmarata named his adopted son as Chitraratha and also that people called him Romapada.  When King Dharmaratha grew old , He decided to make Romapada as the ruler of Anga. Augusto Ruspoli-Ottoboni, dei Principi Ruspoli (Rome, September 8, 1880 – Rome, 1912), was an Italian aristocrat, son of Mario Ruspoli and Costanza Boncompagni-Ludovisi-Ottoboni.  Mario was the youngest son of Augusto Ruspoli, who was the youngest son of Alessandro Ruspoli, 4th Prince of Cerveteri.  And Costanza was daughter of Marco Boncompagni Ludovisi Ottoboni, 10th Duke of Fiano. Thorstein Eiriksson (Old Norse: "Þórsteinn Eiríksson" ) was the third and youngest son of Erik the Red. Erik Thorvaldsson (Old Norse: "Eiríkr Þorvaldsson" ; 950 – c. 1003), known as Erik the Red (Old Norse: "Eiríkr hinn rauði" ) was a Norwegian Viking, remembered in medieval and Icelandic saga sources as having founded the first Norse settlement in Greenland.  The Icelandic tradition indicates that he was born in the Jæren district of Rogaland, Norway, as the son of Þorvald Ásvaldsson, he therefore also appears, patronymically, as Erik Thorvaldsson ("Eiríkr Þorvaldsson").  The appellation "the Red" most likely refers to his hair color and the color of his beard.  Leif Erikson, the famous Icelandic explorer, was Erik's son. Hamoud bin Abdulaziz al Saud was the only child of Futaimah Al-Yamania and the youngest son to live to adulthood of the founder of Saudi Arabia, King Abdulaziz ibn Saud.  Born in 1947, he died on 26 February 1994 at the age of 47 years.  He is the only one not represented in the Allegiance Council originally (later joined in similar circumstances by Prince Fawwaz upon his death) because he died without sons, only having one daughter.  Some sources say that he died in Saudi Arabia while talking with King Fahd.  He was also sometimes threatened by his brothers because he was the youngest of all his siblings.  He had a younger half-brother Jiluwi (II) who was born in 1952, but died the same year.  He was the youngest surviving son of Abdulaziz until his death in 1994, Thus, making Muqrin bin Abdulaziz the youngest-surviving son of King Abdulaziz. The Dalrymple-Hay Baronetcy, of Park Place in the County of Wigtown, is a title in the Baronetage of Great Britain.  It was created on 27 April 1798 for Colonel John Dalrymple-Hay.  Born John Dalrymple, he was the husband of Susan, daughter of Sir Thomas Hay, 3rd Baronet, of Park (see Hay baronets for earlier history of this title).  On inheriting his father-in-law's estates in 1794 he assumed by Royal licence the additional surname of Hay.  Four years later the baronetcy held by his father-in-law was revived in his favour.  His grandson, the third Baronet (who succeeded his father), was an Admiral in the Royal Navy and Conservative politician.  His third and youngest son, the fifth Baronet (who succeeded his childless elder brother), was a Clerk in the Foreign Office from 1887 to 1895 and in the Privy Council Office from 1895 to 1928.  On his death the line of the third Baronet failed and the title passed to the late Baronet's first cousin twice removed, the sixth Baronet.  He was the eldest son of Brian George Rowland Dalrymple-Hay (1898–1943), a Colonel in the Indian Cavalry, son of George Houston Dalrymple-Hay (1865–1948), fifth son of George James Dalrymple-Hay (1828–1891), a Colonel in the Bengal Staff Corps, second son of the second Baronet (and eldest son of his second marriage).  As of 2009 the title is held by the seventh Baronet's son, the eighth Baronet, who succeeded in January 2009.
Answer: Thorstein Eiriksson