Frederick II (; 24 January 1712 – 17 August 1786) was a King in Prussia (1740–1786) from the Hohenzollern dynasty. As a prince-elector of the Holy Roman Empire, he was Frederick IV Margrave of Brandenburg. He was also the sovereign prince of the Principality of Neuchâtel. Victorious in war, he became known as Frederick the Great () and was nicknamed "der alte Fritz" ("Old Fritz").