Elector of Brandenburg in the context of "Lustgarten"

Frederick William III (German: Friedrich Wilhelm III.; 3 August 1770 – 7 June 1840) was King of Prussia from 16 November 1797 until his death in 1840. He was concurrently Elector of Brandenburg in the Holy Roman Empire until 6 August 1806, when the empire was dissolved.

Frederick William III ruled Prussia during the times of the Napoleonic Wars. The king reluctantly joined the Sixth Coalition against Napoleon in the German campaign of 1813. Following Napoleon's defeat, he took part in the Congress of Vienna, which assembled to settle the political questions arising from the new, post-Napoleonic order in Europe. His primary interests were internal – the reform of Prussia's Protestant churches. He was determined to unify the Protestant churches to homogenize their liturgy, organization, and architecture. The long-term goal was to have fully centralized royal control of all the Protestant churches in the Prussian Union of Churches.

King in Prussia (German: König in Preußen) was a title used by the Prussian kings (also in personal union Electors of Brandenburg) from 1701 to 1772. Subsequently, they used the title King of Prussia (König von Preußen).

The House of Hohenzollern ruled Brandenburg as Prince-Electors, and were subjects of the Holy Roman Emperor. Since 1618, the Electors of Brandenburg had also ruled the Duchy of Prussia, which lay outside the empire, in a personal union. The dual state was known unofficially as Brandenburg-Prussia. Originally the dukes of Prussia held the fief as vassals of the King of Poland, until the Treaties of Labiau (1656) and Bromberg (1657), with which Frederick William, the Great Elector, achieved full sovereignty from the Polish Crown. His son, Elector Frederick III, then sought to show his greatness by adopting the title king.

Frederick William I (German: Friedrich Wilhelm I.; 14 August 1688 – 31 May 1740), known as the Soldier King (German: Soldatenkönig), was King in Prussia and Elector of Brandenburg from 1713 until his death in 1740, as well as Prince of Neuchâtel.

Born in Berlin, he was raised by the Huguenot governess Marthe de Roucoulle. His political awakening occurred during the Great Northern War's plague outbreak in Prussia, leading to his challenge against corruption and inefficiency in government. He initiated reforms, especially in the military, doubling the Prussian Army and increased the officer corps to 3,000. A believer in absolute monarchy, he focused on state development and financial reorganization, imposing taxes and stringent regulations on public servants. He made efforts to reduce crime, corruption and centralized his authority during his 27 years' reign, cementing Prussia as a regional power.