Frederick Augustus II, Grand Duke of Oldenburg
Frederick Augustus II( 16 November 1852 in Oldenburg – 24 February 1931 in Rastede) was the last ruling Grand Duke of Oldenburg.
He married Princess Elisabeth Anna of Prussia, daughter of Princess Maria Anna of Anhalt- Dessau and Prince Frederick Charles of Prussia.
After her death, he married Elisabeth Alexandrine of Mecklenburg- Schwerin.
Frederick VI, Duke of Swabia
Frederick VI of Hohenstaufen (February 1167 – 20 January 1191) was duke of Swabia from 1170 until his death at the siege of Acre.
Judith of Hohenstaufen
Judith of Hohenstaufen, also known as" Judith of Hohenstaufen" or" Judith of Swabia"( – 7 July 1191), a member of the Hohenstaufen dynasty, was Landgravine of Thuringia from 1150 until 1172 by her marriage with the Ludovingian landgrave Louis II.
She was baptized as" Judith", but was commonly called" Jutta" or" Guta".
Sometimes the Latinate form" Clementia" was used, or" Claritia" or" Claricia".
Anna von Schweidnitz
Anna of Schweidnitz( Świdnica)( also known as Anne or Anna of Świdnica)( Świdnica, 1339 – 11 July 1362 in Prague) was Queen of Bohemia, German Queen, and Empress of the Holy Roman Empire.
She was the third wife of Emperor Charles IV.
Anna of Mecklenburg
Anna of Mecklenburg( 14 October 15334 July 1602), was a Duchess consort of Courland by marriage to the Duke of Courland, Gotthard Kettler.
She was the daughter of Albrecht VII, Duke of Mecklenburg and Anna of Brandenburg.
Anna is the first woman in Livonia whose life story is entirely historically confirmed.
Anna of Hohenstaufen
Anna of Hohenstaufen (1230 – April 1307), born Constance, was an Empress of Nicaea.
She was a daughter of Frederick II, Holy Roman Emperor and Bianca Lancia.
Countess Anna of Nassau
Countess Anna of Nassau (5 November 1563 – 13 June 1588) was a daughter of William the Silent and his second wife, Anna of Saxony.
She was the wife of William Louis, Count of Nassau-Dillenburg.
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:
Princess Elisabeth Anna of Prussia
Princess Elisabeth Anna of Prussia (8 February 1857 – 28 August 1895) was a German princess.
She was the second child of Prince Frederick Charles of Prussia and Princess Maria Anna of Anhalt-Dessau.
The Elisabeth-Anna-Palais was named in her honor after her early death in 1895.
Frederick I, Duke of Swabia
Frederick I( c. 1050 – 1105 before 21 July) was Duke of Swabia from 1079 to his death, the first ruler from the House of Hohenstaufen(" Staufer").

Question: What nationality is Anna Of Hohenstaufen's father?
Answer: Holy Roman Empire