The grandfather of  Duke Peter Alexandrovich was the Duke of what European dynasty of North German Origin
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Duke Peter Georgievich of Oldenburg Duke Konstantin Friedrich Peter Georgievich of Oldenburg (26 August 1812 in Yaroslavl, Russian Empire – 14 May 1881 in St. Petersburg, Russian Empire) was a Duke of the House of Oldenburg. He was the grandfather of Duke Peter Alexandrovich of Oldenburg as well as grandfather of Grand Duke Nicholas Nikolaevich, General of the Imperial Russian Army during World War I. His great-great grandson, Nicholas Romanov, was the President of the Romanov Family Association until his death in 2014.
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House of Oldenburg The House of Oldenburg is a European dynasty of North German origin. It is one of Europe's most influential royal houses, with branches that rule or have ruled in Denmark, Iceland, Greece, Norway, Russia, Sweden, Schleswig, Holstein, and Oldenburg. The current Queen of Denmark and King of Norway, the former King of Greece, the consorts of Greece and the United Kingdom, as well as the first twelve names in the line of succession to the British throne, are all patrilineal members of the Glücksburg branch of this house.
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Grand Duchess Xenia Alexandrovna of Russia Grand Duchess Xenia Alexandrovna of Russia (Russian: Ксения Александровна Романова ; 6 April [O.S. 25 March] 1875 – 20 April 1960) was the elder daughter and fourth child of Emperor Alexander III of Russia and Empress Maria Feodorovna of Russia (née Princess Dagmar of Denmark) and the sister of Emperor Nicholas II. She married a cousin, Grand Duke Alexander Mikhailovich of Russia, with whom she had seven children. She was the mother-in-law of Felix Yusupov and a cousin of Grand Duke Dmitri Pavlovich of Russia who, together, killed Grigori Rasputin, holy healer to her nephew, the haemophiliac Tsarevich Alexei Nikolaevich of Russia. During her brother's reign she recorded in her diary and letters increasing concern about his rule. After the fall of the monarchy in February 1917 she fled Russia, eventually settling in the United Kingdom.
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Prince Feodor Alexandrovich of Russia Prince Feodor Alexandrovich of Russia (23 December 1898 – 30 November 1968) was the second son and third child of Grand Duke Alexander Mikhailovich of Russia and Grand Duchess Xenia Alexandrovna of Russia. He was also a nephew of Nicholas II of Russia, the last Tsar.
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Peter of Cantabria Peter (Latin: "Petrus" , Spanish: "Pedro" ; died 730) was the Duke of Cantabria. While various writers have attempted to name his parentage, (for example, making him son or brother of King Erwig), early sources say nothing more specific than the chronicle of 'Pseudo-Alfonso': that he was ""ex semine Leuvigildi et Reccaredi progenitus"" (descended from the bloodline of Liuvigild and Reccared I). He was the father of King Alfonso I and of Fruela of Cantabria, father of Kings Aurelius and Bermudo I.
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Frederick Augustus I of Saxony Frederick Augustus I (full name: "Frederick Augustus Joseph Maria Anthony John Nepomuk Aloysius Xavier"; German: "Friedrich August Josef Maria Anton Johann Nepomuk Alois Xavier" ; Polish: "Fryderyk August Józef Maria Antoni Jan Nepomucen Alojzy Ksawery Wettyn" ; 23 December 1750 – 5 May 1827) was King of Saxony (1805–1827) from the House of Wettin. He was also Elector Frederick Augustus III ("Friedrich August III.") of Saxony (1763–1806) and Duke Frederick Augustus I (Polish: "Fryderyk August I" ) of Warsaw (1807–1813).
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Henry the Fowler Henry the Fowler (German: "Heinrich der Finkler" or "Heinrich der Vogler "; Latin: "Henricus Auceps" ) (876 – 2 July 936) was the duke of Saxony from 912 and the elected king of East Francia (Germany) from 919 until his death in 936. As the first non-Frankish king, he established the Ottonian Dynasty of kings and emperors, he is generally considered to be the founder and first king of the medieval German state, known until then as East Francia. An avid hunter, he obtained the epithet "the Fowler" because he was allegedly fixing his birding nets when messengers arrived to inform him that he was to be king. By his death in July 936 Henry had prevented collapse of royal power, as had happened in West Francia, and left a much stronger kingdom to his successor Otto I. Henry died on 2 July 936 in his royal palace in Memleben, one of his favourite places. He was buried at Quedlinburg Abbey, established by his wife Matilda in his honor.
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Grand Duke Konstantin Pavlovich of Russia Konstantin Pavlovich (Russian: Константи́н Па́влович ; 27 April 177927 June 1831) was a grand duke of Russia and the second son of Emperor Paul I and Sophie Dorothea of Württemberg. He was the Tsesarevich of Russia throughout the reign of his elder brother Alexander I, but had secretly renounced his claim to the throne in 1823. For 25 days after the death of Alexander I, from 19 November (O.S.)/1 December 1825 to 14 December (O.S.)/26 December 1825 he was known as "His Imperial Majesty Konstantin I Emperor and Sovereign of Russia", although he never reigned and never acceded to the throne. His younger brother Nicholas became Tsar in 1825. The succession controversy became the pretext of the Decembrist revolt.
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Adalrich, Duke of Alsace Adalrich (Latin: "Adalricus" ; reconstructed Frankish: "*Adalrik"; died after 683 AD), also known as Eticho, was the Duke of Alsace, the founder of the family of the Etichonids and of the Habsburg, and an important and influential figure in the power politic of late seventh-century Austrasia.
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Duke Paul Frederick of Mecklenburg (1882–1904) Duke Paul Frederick of Mecklenburg (German: "Herzog Paul Friedrich zu Mecklenburg" ; given names: "Paul Frederick Charles Alexander Michael Hugh"; 12 May 1882 – 21 May 1904) was a member of the House of Mecklenburg-Schwerin and a German soldier and sailor. He was styled "His Highness" Duke Paul Frederick of Mecklenburg.
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Frederick William I of Prussia Frederick William I (German: "Friedrich Wilhelm I" ) (14 August 1688 – 31 May 1740), known as the 'Soldier King,' was the King in Prussia and Elector of Brandenburg from 1713 until his death, as well as the father of Frederick the Great. He was in personal union the sovereign prince of the principality of Neuchâtel.
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Grand Duke Sergei Alexandrovich of Russia Grand Duke Sergei Alexandrovich of Russia ("Сергей Александрович"; May 11, 1857 – February 17, 1905) was the fifth son and seventh child of Emperor Alexander II of Russia. He was an influential figure during the reigns of his brother Emperor Alexander III of Russia and his nephew Emperor Nicholas II, who was also his brother in law through Sergei's marriage to Elizabeth the sister of Tsarina Alexandra.
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Peter the Great Peter the Great (Russian: Пётр Вели́кий , "Pyotr Velikiy"; ] ), Peter I (Russian: Пётр I , "Pyotr I"; ] ) or Peter Alexeyevich (Russian: Пётр Алексе́евич ; ] ; 9 June [O.S. 30 May] 1672  – 8 February [O.S. 28 January] 1725 ) ruled the Tsardom of Russia and later the Russian Empire from 7 May (O.S. 27 April) 1682 until his death, jointly ruling before 1696 with his elder half-brother, Ivan V. Through a number of successful wars he expanded the Tsardom into a much larger empire that became a major European power. He led a cultural revolution that replaced some of the traditionalist and medieval social and political systems with ones that were modern, scientific, westernized, and based on The Enlightenment. Peter's reforms made a lasting impact on Russia and many institutions of Russian government trace their origins to his reign.
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Ernst Gunther, Duke of Schleswig-Holstein Ernst Gunther, Duke of Schleswig-Holstein (August 11, 1863 – February 22, 1921) was a son of Frederick VIII, Duke of Schleswig-Holstein and Princess Adelheid of Hohenlohe-Langenburg. He inherited his father's title as titular duke of Schleswig-Holstein.
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Archduke Karl Ferdinand of Austria Archduke Karl Ferdinand of Austria (Vienna, 29 July 1818 – Gross Seelowitz (Židlochovice Castle), 20 November 1874) was the second son of Archduke Charles, Duke of Teschen (1771–1847) and Princess Henrietta of Nassau-Weilburg, and the maternal grandfather of King Alfonso XIII of Spain.
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Grand Duke Boris Vladimirovich of Russia Grand Duke Boris Vladimirovich of Russia (Russian: Борис Владимирович ; 24 November 1877 – 9 November 1943) was a son of Grand Duke Vladimir Alexandrovich of Russia, a grandson of Tsar Alexander II of Russia and a first cousin of Tsar Nicholas II.
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House of Bismarck The House of Bismarck is a German noble family that rose to prominence in the 19th-century, largely through the achievements of the statesman Otto von Bismarck. He was granted the hereditary title of Prince of Bismarck in 1871, a hereditary comital title in 1865 and a ducal title, Duke of Lauenburg, held only for his own lifetime. Several of Otto's descendants, notably his son Herbert, Prince of Bismarck, were also politicians.
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Grand Duke Nicholas Mikhailovich of Russia Grand Duke Nicholas Mikhailovich of Russia (Russian: "Великий князь" Никола́й Миха́йлович , 26 April 1859 – 28 January 1919) was the eldest son of Grand Duke Michael Nikolaevich of Russia and a first cousin of Alexander III.
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Stubenberg family Stubenberg is a noble family from Austria documented since about 1160, with its ancestral seat at Stubenberg, Styria. The dynasty held important posts in the Habsburg Monarchy and had hereditary membership in the Hungarian House of Magnates. They are in the line of succession to the British throne.
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William, Prince of Wied William V, Prince of Wied (German: "Wilhelm Adolph Maximilian Karl Fürst von Wied" ; 22 August 184522 October 1907) was a German officer and politician, elder son of Hermann, Prince of Wied. He was the father of William, Prince of Albania and brother of Queen Elisabeth of Romania.
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Franz, Duke of Bavaria Franz, Duke of Bavaria (German: "Franz Bonaventura Adalbert Maria Herzog von Bayern"; born 14 July 1933) is head of the House of Wittelsbach, the former ruling family of the Kingdom of Bavaria. His great-grandfather King Ludwig III was the last ruling monarch of Bavaria until deposed in 1918.
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Duke Adam of Württemberg Adam Karl Wilhelm Nikolaus Paul Eugen von Württemberg (16 January 1792 – 26 July 1847) was a Duke of Württemberg and General in Russian and Polish-Russian service.