Kingdom of Prussia

• 1. Foundations And Establishment

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  In 1518, the House of Hohenzollern took control of the Margraviate of Brandenburg. This marked the beginning of a long political journey that would eventually create a kingdom. The rulers of Brandenburg inherited the Duchy of Prussia in 1618 through a personal union with a younger branch of their own family. For decades, these two territories existed separately under one ruler but remained legally distinct entities. The Holy Roman Empire held authority over Brandenburg while Poland claimed sovereignty over Ducal Prussia.

  The path to full independence required complex diplomatic maneuvering during the Second Northern War. Treaties signed at Labiau and Wehlau-Bromberg by September 1657 granted the Hohenzollerns complete sovereignty over the Prussian duchy. This legal breakthrough allowed them to act as independent monarchs rather than vassals. In November 1700, Frederick III secured permission from Emperor Leopold I to elevate his title. He crowned himself King in Prussia on the 18th of January 1701, establishing the Kingdom of Prussia.

  This new title carried significant legal fiction since no kingdoms could exist within the Holy Roman Empire except for Bohemia and Italy. Frederick chose the style King in Prussia to acknowledge that he was only fully sovereign in the former duchy outside imperial borders. Within Brandenburg and other imperial territories, he remained an Elector subject to the emperor's nominal authority. By 1772, after acquiring Royal Prussia during the First Partition of Poland, the rulers finally adopted the simpler title King of Prussia.

• 2. Military Ascendancy Under Frederick

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  King Frederick II ascended to the throne in 1740 with plans to expand territory through military force. He used a disputed treaty from 1537 as justification to invade Silesia when the Piast dynasty ruling there died out. Austrian Queen Maria Theresa rejected his offer to protect her if she ceded the province. Despite this rejection, Austria faced multiple enemies simultaneously and eventually signed the Treaty of Berlin in 1742, formally ceding most of Silesia to Prussia.

  Austrian attempts to reclaim lost territory led to renewed conflict in 1744. Frederick invaded Saxony and Bohemia over several months starting in 1756, initiating what became known as the Seven Years War. The Prussian Army fought against Austria, Russia, France, Sweden, and Hanover simultaneously while relying on limited allies like Britain. Russian troops briefly occupied both Berlin and Königsberg by October 1760 before Empress Elizabeth of Russia died in 1762.

  The death of Elizabeth brought Peter III to power who favored Prussia and withdrew Russian forces from the war. This Miracle of the House of Brandenburg allowed Prussia to survive despite near defeat. After defeating Austrian forces at the Battle of Burkersdorf and benefiting from British victories elsewhere, Prussia forced a return to pre-war boundaries. These military successes established Prussia as a major European great power and confirmed its dominant role among German states.

• 3. Territorial Expansion Through Partition

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  Frederick II initiated the first Partition of Poland between Russia, Prussia, and Austria in 1772 to maintain regional balance of power. The Kingdom of Prussia annexed most of Royal Prussia including Warmia, allowing rulers to finally adopt the title King of Prussia instead of King in Prussia. The newly acquired territory organized into West Prussia province with Marienwerder serving as capital. Adjustments transferred Warmia districts to East Prussia while connecting previously separated eastern territories.

  After Frederick's death in 1786, his nephew Frederick William II continued expansion efforts. In 1793, Prussia gained large parts of western Poland including Thorn and Danzig which had remained Polish after earlier partitions. These areas became part of West Prussia while other regions formed South Prussia province. By 1795, the Polish-Lithuanian Commonwealth ceased to exist entirely when Prussia acquired Warsaw and surrounding territories south and east of East Prussia.

  Most new lands organized into New East Prussia province while South Prussia gained areas immediately south of the Vistula River. A small region south of South Prussia became New Silesia. With the Polish state gone, Prussia now shared borders with both the Habsburg monarchy and Russia. Germanization policies implemented over following decades changed local perceptions from neutrality to resistance among Polish populations.

• 4. Napoleonic Defeat And Reforms

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  Prussian troops invaded Hanover in April 1801 with 24,000 soldiers surprising the territory which surrendered without fighting. French forces later recaptured Hanover and Bremen-Verden in early 1806 before Napoleon dissolved the Holy Roman Empire on August 6 that year. King Frederick William III became sovereign ruler of all Hohenzollern domains but faced immediate military challenges. On the 14th of October 1806, Prussian armies suffered defeat at the Battle of Jena-Auerstedt forcing the king to flee temporarily to Memel.

  Treaties signed at Tilsit in 1807 stripped Prussia of about half its territory including land gained during Second and Third Partitions of Poland. The kingdom lost all territory west of the Elbe river and faced French occupation of remaining lands. France required Prussia to join the Continental System against Britain while occupying territories at Prussian expense. These humiliating losses triggered comprehensive reforms led by Karl Freiherr vom Stein and Karl August Fürst von Hardenberg.

  After Napoleon's defeat in Russia in 1812, Prussia joined the Sixth Coalition during Wars of Liberation. Marshal Gebhard Leberecht von Blücher commanded Prussian troops who contributed crucially to victory over Napoleon at Waterloo in 1815. At the Congress of Vienna, Prussia regained most pre-1806 territory plus new acquisitions including 40% of Saxony and much of Westphalia and Rhineland. This expansion stretched the kingdom uninterrupted from the Niemen River east to the Elbe west.

• 5. Bismarck And German Unification

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  Otto von Bismarck took office as Prussian ambassador to France on the 23rd of September 1862 after King William I appointed him following a budget dispute with parliament. Bismarck argued that since no agreement existed between king and legislature regarding military funding, government must continue operating under old budgets. This legal theory allowed him to implement William's military reforms without parliamentary approval from 1862 until 1866.

  The Second War of Schleswig began in 1864 when Prussia initiated conflict against Denmark gaining assistance from Austria. Both Schleswig and Holstein surrendered to Prussia and Austria respectively after Denmark suffered sound defeat. Disputes over administration of these territories triggered Austro-Prussian War of 1866 also known as Seven Weeks War. Prussia allied with Italy and northern German states to crush Austrian-led coalition forces.

  Following victory, Prussia annexed four smaller allies including Hanover, Hesse, Nassau, and Frankfurt while effectively taking Saxe-Lauenburg through personal union. These territorial gains connected previously separated Rhineland and Westphalia possessions geographically for the first time. Counting de facto annexation of Saxe-Lauenburg, Prussia now stretched uninterrupted across northern two-thirds of Germany. In 1866, Prussia cajoled twenty-one states north of Main River into forming North German Confederation where it held dominant position.

• 6. Constitutional Evolution And Politics

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  Frederick William IV issued Prussia's first constitution by his own authority in 1848 modifying it further in 1850. The lower house called Landtag elected all males over age 25 using three-class franchise system where voting power depended on taxes paid. One typical election showed first class comprising only 4% of voters yet choosing same number of electors as third class containing 82% of population. This arrangement assured dominance by wealthy landowning classes especially in eastern provinces.

  The upper house renamed House of Lords appointed directly by king retained full executive authority with ministers responsible solely to monarch. Despite liberal elements like jury courts and fundamental rights guarantees, the king maintained absolute veto over laws restricting separation of powers. Military operated essentially as state within state while Prussian Secret Police formed response to revolutions aided conservative government control.

  In imperial elections after 1871, all men over 25 received equal votes but Prussia kept its weighted three-class franchise for internal kingdom matters. Since imperial chancellor also served as Prussian prime minister most of empire existence, leaders had to seek majorities from legislatures elected under completely different systems. Rural areas became grossly overrepresented from 1890s onward despite cities accounting for two-thirds of population within twenty years of empire creation.

• 7. Imperial Dominance And Decline

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  King William I died in 1888 allowing Crown Prince Frederick III to succeed him as emperor. The new ruler planned transformation toward more liberal monarchy based on British model but suffered inoperable throat cancer dying after only ninety-nine days on throne. His twenty-nine-year-old son William II succeeded him having rebelled against parents' liberal efforts earlier becoming thoroughly Prussianized under Bismarck's tutelage.

  Kaiser William II rapidly soured relations with British and Russian royal families becoming their rival then enemy before World War One began in 1914. During the Great War ending the 11th of November 1918, Prussia supplied significant numbers of soldiers and sailors while Junkers dominated higher military ranks. Portions of Eastern Front fought directly on Prussian soil alongside Germany experiencing increasing revolutionary troubles throughout conflict.

  Uprisings beginning in Berlin and other centers started civil conflict of German Revolution 1918-1919. By late 1918 Social Democratic Party controlled Prussian House of Representatives advocating Marxism. King William discovered impossibility retaining separate Prussian crown since imperial constitution tied both crowns together despite his belief ruling empire in personal union with kingdom. Military lost support for fighting on behalf of monarchy leading to abdication announced the 9th of November 1918.