Peter I was King of Serbia from 15 June 1903 to 1 December 1918. On 1 December 1918, he became King of the Serbs, Croats and Slovenes, and he held that title until his death three years later. Wikipedia
Born: July 11, 1844, Belgrade, Serbia
Died: August 16, 1921 (age 77 years), Belgrade, Serbia
Grandchildren: Peter II of Yugoslavia, Prince Tomislav of Yugoslavia, Prince Andrew of Yugoslavia, and more
Spouse: Princess Zorka of Montenegro (m. 1883–1890)
Great-grandparents: Jakov Nenadović, Marica Jovanović, Petar Jovanović, and more