Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.

Alexander I (Serbian Cyrillic: Александар Обреновић, romanized: Aleksandar Obrenović; 14 August 1876 – 11 June 1903) reigned as the king of Serbia from 1889 to 1903 when he and his wife, Draga Mašin, were assassinated by a group of Royal Serbian Army officers, led by Captain Dragutin Dimitrijević.