
Karadjordjevic king who led Serbia in WWI.
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Petar I became King of Serbia in June 1903 after the assassination of Alexander I and the end of the Obrenovic dynasty. His accession restored the Karadjordjevic dynasty to the throne.
Petar I led Serbia during the First and Second Balkan Wars (1912-1913), which resulted in significant territorial expansion. Serbia gained Kosovo, Macedonia, and parts of Albania, doubling its territory.
Petar I led Serbia through World War I after the Austro-Hungarian invasion in 1914. Despite initial victories, Serbia was overrun in 1915, and the king led the army and government in exile on Corfu.
Petar I was proclaimed King of the newly formed Kingdom of Serbs, Croats, and Slovenes in December 1918. This united South Slavic peoples into a single state, later known as Yugoslavia.
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