Archduke Franz Ferdinand of Austria in the context of "Mayerling incident"

The July Crisis was a series of interrelated diplomatic and military escalations among the major powers of Europe in mid-1914, which led to the outbreak of World War I. It began on 28 June 1914 when the Bosnian Serb nationalist Gavrilo Princip assassinated Archduke Franz Ferdinand, heir presumptive to the Austro-Hungarian throne, and his wife Sophie, Duchess of Hohenberg. A complex web of alliances, coupled with the miscalculations of numerous political and military leaders (who either regarded war as in their best interests, or felt that a general war would not occur), resulted in an outbreak of hostilities amongst most of the major European states by early August 1914.

Following the murder, Austria-Hungary sought to inflict a military blow on Serbia, to demonstrate its own strength and to dampen Serbian support for Yugoslav nationalism, viewing it as a threat to the unity of its multi-national empire. However, Vienna, wary of the reaction of Russia (a major supporter of Serbia), sought a guarantee from its ally, Germany, that Berlin would support Austria in any conflict. Germany guaranteed its support through what came to be known as the "blank cheque", but urged Austria-Hungary to attack quickly to localise the war and avoid drawing in Russia. However, Austro-Hungarian leaders would deliberate into mid-July before deciding to give Serbia a harsh ultimatum, and would not attack without a full mobilisation of the army. In the meantime, France met with Russia, reaffirmed their alliance, and agreed they would support Serbia against Austria-Hungary in the event of a war.

Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilo prǐnt͡sip]; 25 July 1894 – 28 April 1918) was a Bosnian Serb student who assassinated Archduke Franz Ferdinand, heir presumptive to the throne of Austria-Hungary, and his wife Sophie, Duchess von Hohenberg, in Sarajevo on 28 June 1914. The assassination set off the July Crisis, a series of events that within one month led to the outbreak of World War I.

Princip was born in western Bosnia to a poor Serb family. Aged 13, he was sent to Sarajevo, the capital of Austrian-occupied Bosnia, to study at the Merchants' School. He later transferred to the gymnasium, where he became politically aware. In 1911, he joined Young Bosnia, a secret local society aiming to free Bosnia from Austrian rule and achieve the unification of the South Slavs. After attending anti-Austrian demonstrations in Sarajevo, he was expelled from school and walked to Belgrade, Serbia, to continue his education. During the First Balkan War, Princip traveled to Southern Serbia to volunteer with the Serbian army's irregular forces fighting against the Ottoman Empire but was rejected for being too small and weak. He also suffered from tuberculosis which was untreatable at the time and might have played a role in his motivation for the assassination.

The assassination of Archduke Franz Ferdinand was one of the key events that led to World War I. Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated on 28 June 1914 by Bosnian Serb student Gavrilo Princip. They were shot at close range while being driven through Sarajevo, the provincial capital of Bosnia and Herzegovina, formally annexed by Austria-Hungary in 1908.

Princip was part of a group of six Bosnian assassins together with Muhamed Mehmedbašić, Vaso Čubrilović, Nedeljko Čabrinović, Cvjetko Popović and Trifko Grabež coordinated by Danilo Ilić; all but one were Bosnian Serbs and members of a student revolutionary group that later became known as Young Bosnia. The political objective of the assassination was to free Bosnia and Herzegovina of Austro-Hungarian rule and establish a common South Slav ("Yugoslav") state. The assassination precipitated the July Crisis, which led to Austria-Hungary declaring war on Serbia and the start of World War I.

In the history of Austria-Hungary, trialism was the political movement that aimed to reorganize the bipartite Empire into a tripartite one, creating a Croatian state equal in status to Austria and Hungary. Franz Ferdinand promoted trialism before his assassination in 1914 to prevent the Empire from being ripped apart by Slavic dissent. The Empire would be restructured three ways instead of two, with the Slavic element given representation at the highest levels equivalent to what Austria and Hungary had at the time. Serbians saw this as a threat to their dream of a new state of Yugoslavia. Hungarian leaders had a predominant voice in imperial circles and strongly rejected Trialism because it would liberate many of their minorities from Hungarian rule they considered oppressive.

At the end of World War I, its advocates obtained support for a trialist manifesto, but the monarchy as a whole crumbled shortly thereafter.

Sophie, Duchess of Hohenberg (German: Sophie Marie Josephine Albina Gräfin Chotek von Chotkow und Wognin; Czech: Žofie Marie Josefína Albína hraběnka Chotková z Chotkova a Vojnína; 1 March 1868 – 28 June 1914) was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne. Their assassination in Sarajevo sparked a series of events that led, four weeks later, to World War I.

Outrage is a strong moral emotion characterized by a combination of surprise, disgust, and anger, usually in reaction to a grave personal offense. It comes from old French "ultrage", which in turn borrows from classical Latin "ultra", meaning "beyond".

Moral outrage is the emotion of outrage experienced in reaction to an injustice, as such involving a moral judgement, and is often accompanied by a desire to shame and/or punish wrongdoers.

A Requiem (Latin: rest) or Requiem Mass, also known as Mass for the dead (Latin: Missa pro defunctis) or Mass of the dead (Latin: Missa defunctorum), is a Mass of the Catholic Church offered for the repose of the souls of the deceased, using a particular form of the Roman Missal. It is usually celebrated in the context of a funeral (where in some countries it is often called a Funeral Mass).

Musical settings of the propers of the Requiem Mass are also called Requiems, and the term has subsequently been applied to other musical compositions associated with death, dying, and mourning, even when they lack religious or liturgical relevance.

Charles I and IV (German: Karl Franz Josef Ludwig Hubert Georg Otto Maria, Hungarian: Károly Ferenc József Lajos Hubert György Ottó Mária; 17 August 1887 – 1 April 1922) was Emperor of Austria (as Charles I), King of Hungary (as Charles IV), and the ruler of the other states of the Habsburg monarchy from November 1916 until the monarchy was abolished in November 1918. He was the last of the monarchs belonging to the House of Habsburg-Lorraine to rule over Austria-Hungary. The son of Archduke Otto of Austria and Princess Maria Josepha of Saxony, Charles became heir presumptive of Emperor Franz Joseph when his uncle Archduke Franz Ferdinand of Austria was assassinated in 1914. In 1911, he married Princess Zita of Bourbon-Parma.

Charles succeeded to the thrones in November 1916 following the death of his grand-uncle, Franz Joseph. He began secret negotiations with the Allies, hoping to peacefully end the First World War, but was unsuccessful. Despite Charles's efforts to preserve the empire by returning it to federalism and by championing Austro-Slavism, Austria-Hungary hurtled into disintegration: Czechoslovakia and the State of Slovenes, Croats and Serbs were proclaimed, and Hungary broke monarchic ties to Austria by the end of October 1918. Following the Armistice of 11 November 1918, Charles "renounced any participation" in government affairs, but did not abdicate. However, the Republic of German-Austria was proclaimed the following day, and in April 1919 the National Assembly formally dethroned the Habsburgs and banished Charles from German-Austria for life.

Vaso Čubrilović (Serbian Cyrillic: Васо Чубриловић; 14 January 1897 – 11 June 1990) was a Yugoslav and Bosnian Serb scholar and politician.

As a teenager, he joined the South Slav student movement known as Young Bosnia and was involved in the conspiracy to assassinate Archduke Franz Ferdinand of Austria on 28 June 1914. His brother Veljko was also involved in the plot. Čubrilović was convicted of treason by the Austro-Hungarian authorities and given a sixteen-year sentence; his brother was sentenced to death and executed. Čubrilović was released from prison at war's end and studied history at the universities of Zagreb and Belgrade. In 1937, he delivered a lecture to the Serbian Cultural Club in which he advocated for the expulsion of the Albanians from Yugoslavia. Two years later, he became a history professor at the University of Belgrade. Following the Axis invasion of Yugoslavia in April 1941, Čubrilović was arrested by the Germans and sent to the Banjica concentration camp, where he remained imprisoned for much of the war.