King Petar II Karadjordjevic of Yugoslavia in January 1944 (6 Sept. 1923--9 Nov. 1970), eldest child of Queen Marie of Yugoslavia, nee Princess Marie of Romania. Peter would be the last king of his country. He became king at 11 after the assassination of his father, Alexander I. The 1941 German invasion forced Peter to flee Yugoslavia. He was deposed by the Reds in 1945. Peter settled in the US where he died and was buried in 1970. He is the only European monarch ever buried in America.
Petar I Karadjordjevic was the last King of Serbia. He reigned from 1903 to 1914, the "Golden Age of Serbia" or the "Era of Pericles in Serbia" with unrestricted political freedoms, free press, and cultural ascendancy among South Slavs. He was supportive to the movement of Yugoslav unification, hosting in Belgrade various cultural gatherings. Grand School of Belgrade was upgraded into Belgrade University in 1905, with scholars of international renown.
In 1389, Prince Lazar, Serbia’s King Leonidas, stopped the Ottomans from advancing into Europe. Outnumbered more than three to one, he died at the battle of Kosovo which left both armies virtually destroyed. By the time, after finally conquering Serbia in 1459, that the Islamic Ottoman hordes marched onto Vienna, Europe was ready. They were repelled. Had the Serbs not stopped them in Kosovo in 1389 however, the outcome would likely have been much less favourable.