303

Events 
 By place 
 Roman Empire 
 Great Persecution: Emperor Diocletian launches the last major persecution of Christians in the Empire. Hierocles is said to have started the fierce persecution of the Christians under Galerius. They are forbidden to worship in groups, and thousands of them are killed in the next 10 years.
 February 24 – Galerius publishes his edict that begins the persecution of Christians in his portion of the Empire.
 September 25 – On a voyage preaching the gospel, Saint Fermin of Pamplona is beheaded in Amiens, France.
 November 28 – Diocletian makes a visit to Rome. The Augusti and the Caesars are united for the first time to celebrate the 20th anniversary of Diocletian's accession.
 The Triumphal Arch of Maximian is erected in Salonica.

 Asia 
 Sassanid Shah Hormizd II succeeds Narseh.

 America 
 In Mexico the civilization of Teotihuacan flourishes.

 By topic 
 Religion 
 March 4 – Martyrdom of Saint Adrian of Nicomedia.

 Births 
 Magnentius, Roman usurper (d. 353)
 Wang Xizhi, Chinese calligrapher (d. 361)

 Deaths 
 April 23 – Saint George, soldier of the Roman Empire
 September 25 – Saint Fermin, Roman Catholic saint
 Acacius of Byzantium, centurion in the Roman army and martyr
 Adrian of Nicomedia, Christian saint
 Anthimus of Rome
 Cao Huan, last emperor of the Kingdom of Wei
 Cessianus, Roman Catholic saint and martyr
 Crescentinus, patron saint of Urbino
 Erasmus of Formiae
 Expeditus, Roman commander and martyr
 Felix and Adauctus, Christian martyrs
 Lu Ji, Chinese writer and literary critic
 Romanus of Caesarea, martyr 
 Saint Cyriacus
 Saint Devota
 Saint Pantaleon
 Victor Maurus, Christian martyr
 Vitus, Christian saint from Sicily

Category:303