Правительствующий сенат
In February 1857, vojvoda Mirko Petrović-Njegoš replaced his cousin Đorđije Petrović-Njegoš as the President of the Governing Senate of Montenegro and the Highlands, he served during the reign of his brother prince Danilo II and later during the reign of his son prince Nicholas. He held the position of president until his death in August 1867.