Peter I, Karadjordjevic

(1844 –1921) reigned as the last King of Serbia (1903–1918) and as the first King of the Serbs, Croats and Slovenes (1918–1921). Since he was the king of Serbia during a period of great Serbian military success, he was remembered by Serbian people as King Peter the Liberator, and also known as Old King.
Peter was the third son of Alexander Karađorđević, who was forced to abdicate. Peter lived with his family in exile. After the death of his father in 1885, Peter became head of the Karađorđević dynasty. After a military coup d’état and the murder of King Alexander I Obrenović in 1903, Peter became King of Serbia. As king, he advocated a constitutional setup for the country and was famous for his libertarian politics.