Alexander I Karađorđević (Serbo-Croatian: Александар I Карађорђевић, romanized: Aleksandar I Karađorđević, pronounced [aleksǎːndar př̩viː karadʑǒːrdʑevitɕ]; 16 December [O.S. 4 December] 1888 – 9 October 1934), also known as Alexander the Unifier (Aleksandar Ujedinitelj / Александар Ујединитељ [aleksǎːndar ujedǐniteʎ]), was King of the Serbs, Croats and Slovenes from 16 August 1921 to 3 October 1929 and King of Yugoslavia from 3 October 1929 until his assassination. His thirteen-year reign was the longest of the kingdom's three monarchs.
Born in Cetinje, Montenegro, Alexander was the second son and the fourth children of Peter and Zorka Karađorđević. The House of Karađorđević had been removed from power in Serbia 30 years prior by the rival House of Obrenović, and Alexander spent his early life in exile with his father in Montenegro and then Switzerland. Afterwards, he moved to Russia and enrolled in the imperial Page Corps. Following a coup d'état and the murder of King Alexander I Obrenović in 1903 his father became King of Serbia. In 1909, Alexander's elder brother, George, renounced his claim to the throne, making Alexander heir apparent. Alexander distinguished himself as a commander during the Balkan Wars, leading the Serbian army to victory over the Ottoman Turks and the Bulgarians. In 1914, he became prince regent of Serbia. During the First World War, he held nominal command of the Royal Serbian Army.
In 1918, Alexander oversaw the unification of Serbia and the former Austro-Hungarian provinces of Croatia-Slavonia, Slovenia, Vojvodina, Bosnia and Herzegovina, and Dalmatia into the Kingdom of Serbs, Croats and Slovenes on the basis of the Corfu Declaration. He ascended the throne upon his father's death in 1921. An extended political crisis followed, culminating in the assassination of Croat leader Stjepan Radić. In response, Alexander abrogated the Vidovdan Constitution in 1929, prorogued the parliament, changed the name of the country to the Kingdom of Yugoslavia, and established a royal dictatorship. The 1931 Constitution formalised Alexander's personal rule and confirmed Yugoslavia's status as a unitary state, further aggravating the non-Serb population. Political and economic tensions escalated on the outbreak of the Great Depression, which devastated the predominantly rural country. In foreign affairs, Alexander supported the Balkan Pact with Greece, Romania, and Turkey, and sought to improve relations with Bulgaria.
In 1934, Alexander embarked on a state visit to France in order to secure support for the Little Entente against Hungarian revanchism and Fascist Italy's imperialist designs. During a stop in Marseille, he was assassinated by Vlado Chernozemski, a member of the pro-Bulgarian Internal Macedonian Revolutionary Organization, which received assistance from the Croat Ustaše led by Ante Pavelić. French foreign minister Louis Barthou also died in the attack. Alexander was succeeded by his eleven-year-old son, Peter II, under the regency of his first cousin Prince Paul.
Alexander Karađorđević was born on 16 December 1888 [O.S. 4 December] in the Principality of Montenegro as the fourth child and second son of Peter Karađorđević and his wife, Princess Zorka of Montenegro. His paternal grandfather, also named Alexander, had been forced to abdicate as prince of Serbia and surrender power to the rival House of Obrenović. Alexander's maternal grandfather was Nicholas I, Prince of Montenegro. Despite enjoying support from the Russian Empire, at the time of Alexander's birth and early childhood, the House of Karađorđević was in political exile, with family members scattered all over Europe, unable to return to Serbia, due to rivalry with the House of Obrenović.
Serbia had recently been transformed from a principality into a kingdom under the Obrenovićes, who ruled with strong support from the Austro-Hungarian Empire. The antagonism between the two rival royal houses was such, that, after the assassination of Prince Mihailo Obrenović in 1868 (an event the Karađorđevićes were suspected of taking part in), the Obrenovićes resorted to making constitutional changes, specifically proclaiming the Karađorđevićes banned from entering Serbia and stripping them of their civic rights.
Alexander was two when his mother, Princess Zorka, died in 1890 from complications while giving birth to his younger brother, Andrej, who died 23 days later. Alexander spent his childhood in Montenegro. In 1894, his widower father took the four children, including Alexander, to Geneva, Switzerland, where the young man completed his elementary education. Alongside his older brother George, he continued his schooling at the imperial Page Corps in Petrograd, Russian Empire. The British historian Robert Seton-Watson described Alexander as becoming a Russophile during his time in Petrograd, feeling much gratitude for the willingness of the Russian emperor Nicholas II to give him a refuge, where he was treated with much honor and respect.
As a page, Alexander was described as hard-working and determined while also being a "loner" who kept to himself and rarely showed his feelings. Nicholas II invited Alexander to dinners at the Winter Palace, where he was the guest of honor at meals hosted by the Russian imperial family, which was a great honor for a prince from Serbia's deposed princely family. During his time in Petrograd, Alexander visited the Alexander Nevsky Monastery, where the abbot gave Alexander an icon of Prince Alexander Nevsky and guided him to the grave of Marshal Alexander Suvorov. After his visit to the monastery, Alexander expressed the wish to be a great general like Marshal Suvorov or Prince Alexander Nevsky, saying he wanted to command either a great army or a great armada when he was a man.
In 1903, while young George and Alexander were in school, a group of conspirators carried out a bloody coup d'état in the Kingdom of Serbia, in which King Alexander and Queen Draga were murdered and dismembered. The House of Karađorđević thus retook the Serbian throne after 45 years and Alexander's 58-year-old father became King of Serbia, prompting George's and Alexander's return to Serbia to continue their studies. After Alexander's 15th birthday, King Peter had Alexander enlisted in the Royal Serbian Army as a private with instructions to his officers to only promote his son if he proved worthy. On 25 March 1909, Alexander was suddenly recalled to Belgrade by his father with no explanation offered other than that he had an important announcement for his son.
In 1909, a scandal broke when Crown Prince George, Alexander's older brother, killed a servant by kicking him in the stomach. Following pressure from powerful figures such as Prime Minister Nikola Pašić and high-ranking officers Dragutin "Apis" Dimitrijević and Petar Živković, George publicly renounced his claim to the throne in March of that year in favour of Alexander.
In 1910, Alexander nearly died from stomach typhus and was left with stomach problems for the rest of his life. In the run-up to the First Balkan War, Alexander played the role of a diplomat, visiting Sofia to meet Tsar Ferdinand I of Bulgaria for secret talks for a Balkan League to drive the Ottoman Turks out of the Balkans. Both Bulgaria and Serbia had rival claims to the Ottoman region of Macedonia, so Alexander, along with Ferdinand's son Crown Prince Boris, traveled to Petrograd to see the Russian emperor Nicholas II to ask for Russian mediation. In March 1912, Serbia and Bulgaria signed a defensive alliance that was later joined by Greece in May 1912.
In March 1912, Alexander had a meeting with ten senior military commanders. They all agreed to end all internal conflicts in the Royal Serbian Army and fully commit to realizing national goals, which allowed space for consolidation before the two successive Balkan Wars.
In the First Balkan War in 1912, as commander of the First Army, Crown Prince Alexander fought victorious battles in Kumanovo and Bitola. One of Alexander's most cherished moments came when he drove the Ottoman Turks out of Kosovo and on 28 October 1912 led the Serbian army on a review on the Field of Blackbirds. The Field of Blackbirds was where the Serbs under Prince Lazar had been defeated in a legendary battle by the Ottoman sultan Murad I on 28 June 1389, and is regarded by the Serbs as holy ground. It was a great honor for him to pay his respects to the Serbs who had fallen in that earlier battle. In the aftermath of the First Balkan War, disputes emerged among the victors over control of Macedonia, and Serbia and Greece signed an alliance against the Kingdom of Bulgaria.