Draginja "Draga" Obrenović (Serbian Cyrillic: Драгиња "Драга" Обреновић; 23 September [O.S. 11 September] 1867 – 11 June [O.S. 29 May] 1903), née Lunjevica (Луњевица) and formerly Mašin (Машин), was Queen of Serbia as the wife of King Aleksandar Obrenović. She was formerly a lady-in-waiting to Aleksandar's mother, Queen Natalija (until 1897).
Dragutin Dimitrijević (Serbian Cyrillic: Драгутин Димитријевић; 17 August 1876 – 26 June 1917), better known by his nickname Apis (Апис), was a Serbian army officer and chief of the military intelligence section of the Royal Serbian Army general staff in 1913. He is best known as the main leader of the Black Hand, a paramilitary secret society devoted to South Slav irredentism that organised the 1903 overthrow of the Serbian government and assassination of King Alexander I of Serbia and Queen Draga. Many scholars believe that he also sanctioned and helped organize the conspiracy behind the assassination of Archduke Franz Ferdinand on 28 June 1914. This led directly to the July Crisis and the outbreak of World War I.
In 1916, the government in exile of Serbian Prime Minister Nikola Pašić, who considered Dimitrijević's refusal to compromise on South Slav irredentism to represent a serious threat to the secret peace negotiations taking place with Vienna during the Sixtus Affair, filed charges of high treason against the leadership of Unification or Death. Dimitrijević was tried in Thessaloniki before a Serbian Army court martial arraigned by his opponents within the Serbian government. He was found guilty of conspiring to assassinate both the Archduke and Prince Regent Alexander Karađorđević and executed by firing squad, along with two senior associates on 26 June 1917.