Frederick II (German: Friedrich II.; 24 January 1712 – 17 August 1786) was King in Prussia (1740–1786) from the Hohenzollern dynasty.[1] He is best known for his brilliance in military campaigning and organization of Prussian armies. He became known as Frederick the Great (Friedrich der Große) and was nicknamed Der Alte Fritz ("Old Fritz").

Interested primarily in music and philosophy and not the arts of war during his youth, Frederick unsuccessfully attempted to flee from his authoritarian father, Frederick William I, with childhood friend Hans Hermann von Katte, whose execution he was forced to watch after they were captured. Upon ascending to the Prussian throne, he attacked Austria and claimed Silesia during the Silesian Wars, winning military acclaim for himself and Prussia. Near the end of his life, Frederick physically connected most of his realm by conquering Polish territories in the First Partition of Poland.

Frederick was a proponent of enlightened absolutism. For years he was a correspondent of Voltaire, with whom the king had an intimate, if turbulent, friendship. He modernized the Prussian bureaucracy and civil service and promoted religious tolerance throughout his realm. Frederick patronized the arts and philosophers, and wrote flute music. Frederick is buried at his favorite residence, Sanssouci in Potsdam. Because he died childless, Frederick was succeeded by his nephew, Frederick William II of Prussia, son of his brother, Prince Augustus William of Prussia.

Frederick was a gifted musician who played the transverse flute. He composed 100 sonatas for the flute as well as four symphonies. The Hohenfriedberger Marsch, a military march, was supposedly written by Frederick to commemorate his victory in the Battle of Hohenfriedberg during the Second Silesian War. His court musicians included C. P. E. Bach, Johann Joachim Quantz, Carl Heinrich Graun and Franz Benda. A meeting with Johann Sebastian Bach in 1747 in Potsdam led to Bach's writing The Musical Offering.

Frederick also aspired to be a Platonic philosopher king like the Roman emperor Marcus Aurelius. The king joined the Freemasons in 1738 and stood close to the French Enlightenment, corresponding with some of its key figures, such as Voltaire. The personal friendship of Frederick and Voltaire came to an unpleasant end after Voltaire's visit to Berlin and Potsdam in 1750–1753, although they reconciled from afar in later years.

In addition to his native language, German, Frederick spoke French, English, Spanish, Portuguese, and Italian; he also understood Latin, ancient and modern Greek, and Hebrew. Preferring instead French culture, Frederick disliked the German language, literature, and culture, explaining that German authors "pile parenthesis upon parenthesis, and often you find only at the end of an entire page the verb on which depends the meaning of the whole sentence".[45] His criticism led many German writers to attempt to impress Frederick with their writings in the German language and thus prove its worthiness. Many statesmen, including Baron vom und zum Stein, were also inspired by Frederick's statesmanship. Johann Wolfgang von Goethe gave his opinion of Frederick during a visit to Strasbourg (Strassburg) by writing:

Well we had not much to say in favour of the constitution of the Reich; we admitted that it consisted entirely of lawful misuses, but it rose therefore the higher over the present French constitution which is operating in a maze of unlawful misuses, whose government displays its energies in the wrong places and therefore has to face the challenge that a thorough change in the state of affairs is widely prophesied. In contrast when we looked towards the north, from there shone Frederick, the Pole Star, around whom Germany, Europe, even the world seemed to turn ...