Prince Arsenije "Arsen" of Yugoslavia (16 / 17 April 1859 – 19 October 1938) was a dynast of the House of Karadordevic and ancestor of the current cadet branch of the Royal Family which ruled Yugoslavia until 1945. He served as an officer in the Russian Army. He was born in Timisoara a year after his father Prince Alexander Karadordevic had been deposed from the Serbian throne (the predecessor regime to the Yugoslavian monarchy). His mother was Persida Nenadovic. Prince Arsen's elder brother was Peter I, King of Serbia and, later, of the Serbs, Croats and Slovenes. He was brought up at the Lycée Girard in Paris. Served in the Foreign Legion of the French army and took part in the Tonkin expedition. By the Highest command, which followed on 12 December 1886, he enlisted in the Cavalierguard Regiment as a volunteer of the private rank on 30 December. On 1 July 1887 he was promoted to non-commissioned officer, on 1 October of the same year he took the oath of allegiance to the Russian Empire. Having passed the officer's examination at the 2nd military Konstantinovsky school, on 9 August 1888 he was promoted to cornet in the same regiment. In 1892 he was promoted to lieutenant, and on 27 March 1895 he was dismissed from service for domestic reasons as staff-ratmistrov. With the beginning of the Russian-Japanese War, on 13 February 1904 he was appointed to the 1st Nerchinsk Regiment of the Transbaikal Cossack Troops, as assessor. Prince Arsen was married in Saint Petersburg on 1 May

1892 to Princess Aurora Pavlovna Demidova of San Donato, daughter of Pavel Pavlovich Demidov, 2nd Prince of San Donato (whose uncle, Prince Anatoly Demidov, had been first married to Princess Mathilde Bonaparte) and of Prince Pavel's second wife Princess Elena Petrovna Trubetskaya. Their only son was Prince Paul of Yugoslavia who was Regent of Yugoslavia from 9 October 1934 to 27 March 1941. The couple divorced on 26 December 1896 and Aurora Pavlovna was remarried to Count Nicola di Noghera in Genoa on 4 November 1897, with whom she had a daughter, Helena Aurora di Noghera (22 May 1898 – 12 October 1967). Aurora Pavlovna died in Turin on 28 June 1904.

The Royal Guard was an elite guard unit of the Army of the Principality and the Kingdom of Serbia, as well as the Yugoslav Army, responsible for the security of the royal family and the royal home. Although its organization began in 1830, it was officially founded by the decree of Prince Miloš Obrenovic on May 12, 1838. After the declaration of Serbia as a kingdom in March 1882, the number of soldiers grew, and so did the guardsmen. On February 12, 1883, the Guards Squadron finally received the name Guard of Kings. The commander of the guard was the king's first adjutant in the rank of major or lieutenant colonel. The number of members grew, as did the entire army, so in 1893 the guard regiment was formed, and in 1901 the first infantry company of the Royal Guard was formed. During the celebration of the anniversary of the Takovo Uprising in 1886 in the Upper Town of the Belgrade Fortress, King Milan Obrenovic awarded 15 infantry flags, 5 cavalry regimental flags and a guard squadron flag, which was received by the commander, captain second class Mihajlo Kumrijic. The motto was written on the new guard flag: "For the Faith, the King and the Fatherland - the Royal Guard". The reserve composition of the guard was introduced in February 1889. After the May Revolution of 1903, the security of the complex of City Courts (the Old Court, the New Court, the Marshal's Court, the court park and accompanying buildings) was taken over by the court guard made up of an infantry guard company. Members of the Royal Guard played a significant role during the coronation ceremony of King Peter I Karadordevic in Belgrade in 1904, as well as securing the City Palace complex.

The House of Karadordevic dynasty is the name of the former ruling Serbian and deposed Yugoslav royal family. The family was founded by Karadorde Petrovic (1768–1817), the Veliki Vožd of Serbia during the First Serbian uprising of 1804–1813. In the course of the 19th century the relatively short-lived dynasty was supported by the Russian Empire and was opposed to the Austrian-supported House of Obrenovic. The two houses subsequently vied for the throne for several generations. Following the assassination of the Obrenovic King Alexander I of Serbia in 1903, the Serbian Parliament chose Karadorde's grandson, Peter I Karadordevic, then living in exile, to occupy the throne of the Kingdom of Serbia. He was duly crowned as King Peter I, and shortly before the end of World War I in 1918, representatives of the three peoples proclaimed a Kingdom of the Serbs, Croats and Slovenes with Peter I as sovereign. In 1929, the kingdom was renamed Yugoslavia, under Alexander I, the son of Peter I. In November 1945 the family lost their throne when the League of Communists of Yugoslavia seized power during the reign of Peter II. In English, the family name can be anglicized as Karageorgevitch or romanised as Karadjordjevic. Its origin is as a patronym of the sobriquet Karadorde, bestowed upon the