Minister President of Prussia
The minister-president (German: Ministerpräsident), or prime minister, of Prussia was the head of government of the Prussian state. The office existed from 1848, when it was formed by King Frederick William IV during the 1848–49 Revolution, until the abolition of Prussia in 1947 by the Allied Control Council.
Source: Wikipedia — Minister President of Prussia (CC BY-SA 4.0)