Grand Duchy of Posen in the context of "Province of Posen"

Paul Ludwig Hans Anton von Beneckendorff und von Hindenburg (2 October 1847 – 2 August 1934) was a German military officer and statesman who led the Imperial German Army during World War I and later became President of Germany from 1925 until his death in 1934. He played a key role in the Nazi seizure of power in 1933 through his appointment of Adolf Hitler as Chancellor of Germany.

Paul von Hindenburg was born to a family of minor Prussian nobility in the Grand Duchy of Posen. Upon completing his education as a cadet, he enlisted in the Third Regiment of Foot Guards. In this unit, Hindenburg saw combat during the Austro-Prussian and Franco-Prussian wars. In 1873, he was admitted to the prestigious War Academy in Berlin, where he studied before being appointed to the General Staff Corps. In 1885, he was promoted to major and became a member of the German General Staff. After teaching at the War Academy, Hindenburg rose to become a lieutenant general by 1900. In 1911, he retired from the military.

The Duchy of Warsaw (Polish: Księstwo Warszawskie; French: Duché de Varsovie; German: Herzogtum Warschau), also known as the Grand Duchy of Warsaw and Napoleonic Poland, was a French client state established by Napoleon Bonaparte in 1807, during the Napoleonic Wars. It initially comprised the ethnically Polish lands ceded to France by Prussia under the terms of the Treaties of Tilsit, and was augmented in 1809 with territory ceded by Austria in the Treaty of Schönbrunn. It was the first attempt to re-establish Poland as a sovereign state after the 18th-century partitions and covered the central and southeastern parts of present-day Poland.

The duchy was held in personal union by Napoleon's ally, Frederick Augustus I of Saxony, who became the duke of Warsaw and remained a legitimate candidate for the Polish throne. Following Napoleon's failed invasion of Russia, Napoleon seemingly abandoned the duchy, and it was left to be occupied by Prussian and Russian troops until 1815, when it was formally divided between the two countries at the Congress of Vienna. The east-central territory of the duchy acquired by the Russian Empire was subsequently transformed into a polity called Congress Poland, and Prussia formed the Grand Duchy of Posen in the west. The city of Kraków, Poland's cultural centre, was granted "free city" status until its incorporation into Austria in 1846.

Congress Poland or Congress Kingdom of Poland, formally known as the Kingdom of Poland, was a polity created in 1815 by the Congress of Vienna as a semi-autonomous Polish state, a successor to Napoleon's Duchy of Warsaw. It was established when the French ceded a part of Polish territory to the Russian Empire following France's defeat in the Napoleonic Wars. In 1915, during World War I, it was replaced by the German-controlled nominal Regency Kingdom until Poland regained independence in 1918.

Following the partitions of Poland at the end of the 18th century, Poland ceased to exist as an independent nation for 123 years. The territory, with its native population, was split among the Habsburg monarchy, the Kingdom of Prussia, and the Russian Empire. After 1804, an equivalent to Congress Poland within the Austrian Empire was the Kingdom of Galicia and Lodomeria, also commonly referred to as "Austrian Poland". The area incorporated into Prussia initially also held autonomy as the Grand Duchy of Posen outside of German Confederation, but later was demoted to merely a Prussian province (the Province of Posen), and was subsequently annexed in 1866 into the North German Confederation, the predecessor of the German Empire.

The Reichsgau Wartheland (initially Reichsgau Posen, also Warthegau) was a Nazi German Reichsgau formed from parts of Polish territory annexed in 1939 during World War II. It comprised the region of Greater Poland and adjacent areas. Parts of Warthegau matched the similarly named pre-Versailles Prussian province of Posen. The name was initially derived from the capital city, Posen (Poznań), and later from the main river, Warthe (Warta).

During the Partitions of Poland from 1793, the bulk of the area had been annexed by the Kingdom of Prussia until 1807 as South Prussia. From 1815 to 1849, the territory was within the autonomous Grand Duchy of Posen, which was the Province of Posen until Poland was re-established in 1918–1919 following World War I. The area is currently the Greater Poland Voivodeship.

The Greater Poland uprising of 1918–1919, or Wielkopolska uprising of 1918–1919 (Polish: powstanie wielkopolskie 1918–1919 roku; German: Großpolnischer Aufstand) or Poznań War was a military insurrection of Poles in the Greater Poland region (German: Grand Duchy of Posen or Provinz Posen) against German rule. The uprising had a significant effect on the Treaty of Versailles, which granted a reconstituted Second Polish Republic the area won by the Polish insurrectionists. The region had been part of the Kingdom of Poland and then Polish–Lithuanian Commonwealth before the 1793 Second Partition of Poland when it was annexed by the German Kingdom of Prussia. It had also, following the 1806 Greater Poland uprising, been part of the Duchy of Warsaw (1807–1815), a French client state during the Napoleonic Wars.

Prince Antoni Henryk Radziwiłł (Polish pronunciation: [anˈtɔɲi ˈxɛnrɨk raˈd͡ʑiviww]; 13 June 1775 – 7 April 1833) was a Polish and Prussian noble, aristocrat, musician, and politician. Initially a hereditary Duke of Nieśwież and Ołyka, as a scion of the Radziwiłł family he also held the honorific title of a Reichsfürst of the Holy Roman Empire. Between 1815 and 1831 he acted as Duke-Governor (Polish: książę-namiestnik, German: Statthalter) of the Grand Duchy of Posen, an autonomous province of the Kingdom of Prussia created out of Greater Polish lands annexed in the Partitions of Poland.

Moritz Lazarus (15 September 1824 – 13 April 1903), born at Filehne, in the Grand Duchy of Posen, was a German-Jewish philosopher, psychologist, and a vocal opponent of the antisemitism of his time.