Baginda Al Mutawakkil Alallah Sultan Iskandar Ibni Almarhum Sultan Al-Khalidi (8 April 1932 – 22 January 2010) was the 24th Sultan of Johor and the 4th Sultan of modern Johor.
 He succeeded his father, Sultan Ismail, upon the former's death on 10 May 1981, and was the eighth Yang di-Pertuan Agong (Malay for Supreme King or High King) of Malaysia, from 26 April 1984 to 25 April 1989.
 Sultan Iskandar reign lasted for almost 29 years until his death in January 2010, upon which he was succeeded by his oldest son, Sultan Ibrahim Ismail.
 His children are married into the different royal houses of Malaysia.
 His eldest daughter, Tunku Kamariah, the Tengku Puan Laksamana, married the Tengku Laksamana of Selangor, Tengku Sulaiman Shah.
 His successor and eldest son, Sultan Ibrahim married into the Perak Royal Family by marrying Raja Zarith Sofiah.
 His daughter, Tunku Azizah married the heir apparent of Pahang, Tengku Abdullah.
 His younger son, Tunku Abdul Majid married a member of the Kedah Royal Family, Tunku Teh Mazni.
Gunnhildr Sveinsdóttir or Gunnhildr Haraldsdóttir, Guda or Gyda (traditionally died in Gudhem, Västergötland, Sweden, c. 1060) was a queen consort of king Anund Jacob of Sweden and of king Sveinn II of Denmark.
The Boreel, later Boreel Baronetcy, of Amsterdam in the Netherlands, is a title in the Baronetage of England.
 It was created on 21 March 1645 for William Boreel.
 He was Dutch Ambassador to England, Sweden and Venice.
 The title descended in the direct line until the death of his grandson, the third Baronet, in 1710.
 The late Baronet died unmarried and was succeeded by his younger brother, the fourth Baronet.
 He died without male issue and was succeeded by his first cousin, the fifth Baronet.
 He was the son of James Boreel, younger son of the first Baronet.
 He died childless and was succeeded by his nephew, the sixth Baronet.
 He was the son of James Boreel, younger brother of the fifth Baronet.
 He never married and was succeeded by his first cousin once removed, the seventh Baronet.
 He was the grandson of John Hieronymous Boreel, younger brother of the fifth Baronet.
 His son, the eighth Baronet, was created a Jonkheer in the Dutch nobility.
 The title descended from father to son until the death of his grandson, the tenth Baronet, in 1937.
Gyda Anundsdotter of Sweden, also known as Guda and Gunhild (died c. 1048/1049), was a medieval and Viking age Swedish princess and Danish queen consort, spouse of King Sweyn II of Denmark.
Charles X Gustav, also Carl Gustav (Swedish: "Karl X Gustav" ; 8 November 1622 – 13 February 1660), was King of Sweden from 1654 until his death.
 He was the son of John Casimir, Count Palatine of Zweibrücken-Kleeburg and Catherine of Sweden.
 After his father's death he also succeeded him as Pfalzgraf.
 He was married to Hedwig Eleonora of Holstein-Gottorp, who bore his son and successor, Charles XI.
 Charles X Gustav was the second Wittelsbach king of Sweden after the childless king Christopher of Bavaria (1441–1448) and he was the first king of the Swedish "Caroline era", which had its peak during the end of the reign of his son, Charles XI.
 He led Sweden during the Second Northern War, enlarging the Swedish Empire.
 By his predecessor Christina, he was considered "de facto" Duke of Eyland (Öland) before ascending to the Swedish throne.
Sweyn II Estridsson (, Danish: "Svend Estridsen" ) (  1019 – 28 April 1076) was King of Denmark from 1047 until his death in 1076.
 He was the son of Ulf Jarl and Estrid Svendsdatter.
 He was married three times, and fathered 20 children or more out of wedlock, including the five future kings Harald III Hen, Canute IV the Saint, Oluf I Hunger, Eric I Evergood, and Niels.
Gunnilda of Sweden ; Swedish: "Gunhild" and "Gunilla" even "Gyda" - may refer to:
Rasmus Elias Paulson Sindre (23 July 1859 – 3 April 1908) was a Norwegian farmer, newspaper editor and politician.
 He took over the farm Sindre in Nordfjord when his father died in 1882.
 He represented the party Venstre (Norway), being mayor of the Innvik municipality from 1895, thereafter elected to the Parliament of Norway in 1899, serving for the period 1900-02.
 From 1895-1901 he was also editor of the newspaper "Fjordabladet" of Nordfjordeid.
 He was married to Gyda Sindre (b. Støyva, 1858–1946), and they had 8 children together.
 He died of cancer only 48 years old.
Halfdan Christensen (12 December 1873 – 17 September 1950) was a Norwegian stage actor and theatre director.
 He was married twice, first to actress Gyda Christensen, and later to actress Gerda Ring.
 He had his stage début at Den Nationale Scene in 1896.
 He was among the leading actors at the National Theatre from its opening in 1899, and was theatre director from 1911 to 1923, and again from 1930 to 1933.
 During the Second World War he had to flee to Sweden, and there he led the theatre "Fri norsk scene" together with his wife Gerda Ring.
Captain Alexander Arthur Alfonso David Maule Ramsay of Mar DL (21 December 1919 – 20 December 2000) was the only child of Princess Patricia of Connaught, who renounced her royal title and style when she married then-Captain the Hon. Alexander Ramsay in February 1919.
 His mother was the youngest child of Prince Arthur, Duke of Connaught, the third son of Queen Victoria and Prince Albert.
 His father was the third son of John Ramsay, 13th Earl of Dalhousie.
 Alexander was the first cousin of the Queen Ingrid of Denmark, Prince Gustaf Adolf (the father of the current King of Sweden) and their siblings, because their mother, Princess Margaret of Connaught, was Alexander's aunt and wife to the Crown Prince of Sweden.

Question: Gyda of Sweden married the son of who?
Answer: the son of Ulf Jarl