Adelaide of Austria
Adelaide of Austria (Adelheid Franziska Marie Rainera Elisabeth Clotilde; 3 June 1822 – 20 January 1855) was the Queen of Sardinia by marriage to Victor Emmanuel II of Sardinia, future King of Italy, from 1849 until 1855 when she died as a result of childbirth.
She was the mother of Umberto I of Italy.
Victor Amadeus III of Sardinia
Victor Amadeus III( Vittorio Amadeo Maria; 26 June 1726 – 16 October 1796) was King of Sardinia from 1773 to his death.
Although he was politically conservative, he carried out numerous administrative reforms until he declared war on Revolutionary France in 1792.
He was the father of the last three mainline Kings of Sardinia.
Maria Theresa of Austria-Este, Queen of Sardinia
Maria Theresa of Austria-Este (Maria Theresia Josefa Johanna; 1 November 1773 – 29 March 1832) was born an archduchess of Austria-Este and a princess of Modena.
She was later queen of Sardinia as wife of Victor Emmanuel I of Sardinia.
Frederick II, Holy Roman Emperor
Frederick II (26 December 1194 – 13 December 1250) was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225.
He was the son of emperor Henry VI of the Hohenstaufen dynasty and of Constance, heiress to the Norman kings of Sicily.
His political and cultural ambitions were enormous as he ruled a vast area, beginning with Sicily and stretching through Italy all the way north to Germany.
As the Crusades progressed, he acquired control of Jerusalem and styled himself its king.
However, the Papacy became his enemy, and it eventually prevailed.
Viewing himself as a direct successor to the Roman emperors of antiquity, he was Emperor of the Romans from his papal coronation in 1220 until his death; he was also a claimant to the title of King of the Romans from 1212 and unopposed holder of that monarchy from 1215.
As such, he was King of Germany, of Italy, and of Burgundy.
At the age of three, he was crowned King of Sicily as a co-ruler with his mother, Constance of Hauteville, the daughter of Roger II of Sicily.
His other royal title was King of Jerusalem by virtue of marriage and his connection with the Sixth Crusade.
Frequently at war with the papacy, which was hemmed in between Frederick's lands in northern Italy and his Kingdom of Sicily (the "Regno") to the south, he was excommunicated four times and often vilified in pro-papal chronicles of the time and after.
Pope Gregory IX went so far as to call him an Antichrist.
Speaking six languages (Latin, Sicilian, Middle High German, Langues d'oïl, Greek and Arabic), Frederick was an avid patron of science and the arts.
He played a major role in promoting literature through the Sicilian School of poetry.
His Sicilian royal court in Palermo, beginning around 1220, saw the first use of a literary form of an Italo-Romance language, Sicilian.
The poetry that emanated from the school had a significant influence on literature and on what was to become the modern Italian language.
He was also the first king to formally outlaw trial by ordeal, which had come to be viewed as superstitious.
After his death his line did not survive, and the House of Hohenstaufen came to an end.
Furthermore, the Holy Roman Empire entered a long period of decline from which it did not completely recover until the reign of Charles V, 250 years later.
Historian Donald Detwiler wrote:
Ali Rahuma
Ali Khalifa Rahuma( born May 16, 1982) is a Libyan football midfielder who's nationality is Libyan.
He currently plays for Al- Ittihad, and is a member of the Libya national football team.
Salvatore Garau
Salvatore Garau( born 1953) is an Italian artist from the Mediterranean island of Sardinia.
Claudio Gabriele de Launay
Claudio Gabriele de Launay (6 October 1786 – 21 February 1850) was prime minister of the Kingdom of Sardinia from 27 March to 7 May 1849.
Previously he had been the last Viceroy of Sardinia from 1843 to 1848.
Enzo of Sardinia
Enzo (or Enzio; 14 March 1272) was an illegitimate son of the Hohenstaufen emperor Frederick II, who appointed him 'King of Sardinia' in 1238.
He played a major role in the wars between Guelphs and Ghibellines in the Imperial kingdom of Italy, and was captured by his enemies in 1249.
He remained imprisoned in Bologna until his death.
Maria Antonia Ferdinanda of Spain
Maria Antonia Ferdinanda of Spain
(María Antonia Fernanda; 17 November 1729 – 19 September 1785) was a Queen consort of Sardinia by marriage to Victor Amadeus III of Sardinia.
She was the youngest daughter of Philip V of Spain and Elisabeth Farnese.
She was the mother of the last three mainline Kings of Sardinia.
Clotilde of France
Marie" Clotilde" of France( Marie Adélaïde Clotilde Xavière; 23 September 1759 – 7 March 1802), known as Clotilda in Italy, was Queen of Sardinia by marriage to Charles Emmanuel IV of Sardinia.
She was the younger sister of Louis XVI of France.
She was politically active and acted as the de facto first minister of her spouse during his reign.

Question: What nationality is Enzo Of Sardinia's father?
Answer: Holy Roman Empire