King in Prussia in the context of "Frederick I of Prussia"

Frederick II (German: Friedrich II.; 24 January 1712 – 17 August 1786) was the monarch of Prussia from 1740 until his death in 1786. He was the last Hohenzollern monarch titled King in Prussia, declaring himself King of Prussia after annexing Royal Prussia from the Polish–Lithuanian Commonwealth in 1772. His most significant accomplishments include military successes in the Silesian wars, reorganisation of the Prussian Army, the First Partition of Poland, and patronage of the arts and the Enlightenment. Prussia greatly increased its territories and became a major military power in Europe under his rule. He became known as Frederick the Great (German: Friedrich der Große) and was nicknamed "Old Fritz" (German: der Alte Fritz).

In his youth, Prince Frederick was more interested in music and philosophy than war, which led to clashes with his authoritarian father, Frederick William I of Prussia. However, upon ascending to the throne, he attacked and annexed the rich Austrian province of Silesia in 1742, winning military acclaim. He became an influential military theorist, whose analyses emerged from his extensive personal battlefield experience and covered issues of strategy, tactics, mobility and logistics.

The First Partition of Poland took place in 1772 as the first of three partitions that eventually ended the existence of the Polish–Lithuanian Commonwealth by 1795. The growth of power in the Russian Empire threatened the Kingdom of Prussia and the Habsburg monarchy and was the primary motive behind the First Partition.

Frederick the Great, King in Prussia, engineered the partition to prevent Austria, which was envious of Russian successes against the Ottoman Empire, from going to war. Territories in Poland–Lithuania were divided by its more powerful neighbours (Austria, Russia and Prussia) to restore the regional balance of power in Central Europe among those three countries.

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.

The Prussian Navy (German: Preußische Marine), officially the Royal Prussian Navy (German: Königlich Preußische Marine), was the naval force of the Kingdom of Prussia from 1701 to 1867.

The Prussian Navy was created in 1701 from the former Brandenburg Navy upon the dissolution of Brandenburg-Prussia, the personal union of Brandenburg and Prussia under the House of Hohenzollern, after the elevation of Frederick I from Duke of Prussia to King in Prussia. The Prussian Navy fought in several wars but was active mainly as a merchant navy throughout the 18th and 19th centuries, as Prussia's military consistently concentrated on the Prussian Army. The Prussian Navy was dissolved in 1867 when Prussia joined the North German Confederation, and its naval forces were absorbed into the North German Federal Navy.