Frederick II, King of Prussia, 1712-1786.

Jürgen Overhoff and Vanessa de Senarclens (eds.), “An meinem Geist”. Friedrich der Große in seiner Dichtung. Eine Anthologie (Paderborn: Schöningh, 2011)

also see Sean Williams essay on Frederick and poetry during his reign
https://sites.google.com/site/germanliterature/18th-century/frederick-ii

In the early years of Frederick’s reign, poets were enthusiastic about their new monarch. They celebrated their young king and his initial military campaigns in Silesia through a genre of war poetry, ‘Kriegslieder’, of which Gleim and Klopstock composed famous examples. And they were excited by the promise of initiatives supporting the intelligentsia, such as the re-establishment of the Berlin Academy in 1744. However, the general mood soon turned.

As king, Frederick was renowned for being a fine military strategist; but he also continued to show artistic flair in his musical compositions and his writing. Nevertheless, the commonly held belief that Frederick was disparaging of the German language is absolutely correct.