Frederick II (; 24 January 171217 August 1786) was King of Prussia from 1740 until 1786. Frederick's achievements during his reign included his military victories, his reorganization of Prussian armies, his patronage of the Arts and the Enlightenment in Prussia, and his final success against great odds in the Seven Years' War. He became known as Frederick the Great (Friedrich der Große) and was nicknamed Der Alte Fritz ("Old Fritz") by the Prussian people.