Peter I of Serbia place of death Belgrade
World War I and its aftermath
The retired King, spending most of his time in various Serbian spas, remained relatively inactive during the First World War, although occasionally, when  the military situation became critical, he visited trenches on the front-line to check up on morale of his troops. His visit to the firing line prior to the Battle of Kolubara in late 1914 boosted the morale of the retreating Serbian forces and announced a counter-offensive, sparking victory against numerically superior Austro-Hungarian forces (December 1914). Another memorable visit in 1915 involved King Peter, by then 71, picking up a rifle and shooting at enemy soldiers. Following the invasion of Serbia by the joint forces of Germany, Austro-Hungary and Bulgaria in October 1915, King Peter I led the army and tens of thousands of civilian refugees through the high mountains of Albania to the Adriatic sea on a "Calvary known to few peoples".After the dramatic retreat in a harsh winter through the hostile environment of the Albanian highlands from Prizren to the Albanian littoral, a march that took more than 100,000 lives, the King and his army, exhausted by cold and famine, were eventually transported by the  Allies to the Greek isle of Corfu in early 1916. For the rest of World War I King Peter I, already in very poor health, remained on Corfu, which became the seat of the Serbian government-in-exile until December 1918.
On 1 December 1918 King Peter I was proclaimed King of the Serbs, Croats and Slovenes. King Peter stayed abroad until July 1919, then returned to Belgrade, where he died in 1921 at the age of 77. He was solemnly buried in his endowment in Oplenac, the Church of Saint George in the vicinity of Topola in Central Serbia, where his grandfather Karađorđe, the founder of the dynasty, had launched a large-scale insurrection against the Ottomans in 1804.
location of death death place place where they died place of passing final resting place