April events in history

April 19, 65 The freedman Milichus betrayed Piso's plot to kill the Emperor Nero and all the conspirators are arrested
April 14, 69 Vitellius, commander of the Rhine armies, defeats Emperor Otho in the Battle of Bedriacum and seizes the throne
April 17, 69 After the First Battle of Bedriacum, Vitellius becomes Roman Emperor
April 14, 70 Siege of Jerusalem: Titus, son of emperor Vespasian, surrounds the Jewish capital, with four Roman legions
April 16, 73 Masada, a Jewish fortress, falls to the Romans after several months of siege, ending the Great Jewish Revolt
April 9, 193 Lucius Septimius Severus is proclaimed Emperor by his troops in Illyricum (Balkans). He marches with his army (16 legions) to Rome
April 14, 193 Septimius Severus is proclaimed Roman Emperor by the army in Illyricum (in the Balkans)
April 8, 217 Roman Emperor Caracalla is assassinated. He is succeeded by his Praetorian Guard prefect, Marcus Opellius Macrinus
April 12, 238 Gordian II loses the Battle of Carthage against the Numidian forces loyal to Maximinus Thrax and is killed. Gordian I, his father, commits suicide
April 22, 238 Year of the Six Emperors: The Roman Senate outlaws emperor Maximinus Thrax for his bloodthirsty proscriptions in Rome and nominates two of its members, Pupienus and Balbinus, to the throne
April 12, 240 Shapur I is crowned as king of the Sasanian Empire
April 1, 286 Emperor Diocletian elevates his general Maximian to co-emperor with the rank of Augustus and gives him control over the Western regions of the Roman Empire
April 30, 311 The Diocletianic Persecution of Christians in the Roman Empire ends
April 30, 313 Battle of Tzirallum: Emperor Licinius defeats Maximinus II and unifies the Eastern Roman Empire
April 1, 325 Crown Prince Jin Chengdi, age 4, succeeds his father Jin Mingdi as emperor of the Eastern Jin Dynasty
April 28, 357 Emperor Constantius II enters Rome for the first time to celebrate his victory over Magnus Magnentius
April 27, 395 Emperor Arcadius marries Aelia Eudoxia, daughter of the Frankish general Flavius Bauto. She becomes one of the more powerful Roman empresses of Late Antiquity
April 6, 402 Stilicho stymies the Visigoths under Alaric in the Battle of Pollentia
April 10, 428 Nestorius becomes Patriarch of Constantinople
April 7, 451 Attila the Hun sacks the town of Metz and attacks other cities in Gaul
April 1, 457 Majorian is acclaimed emperor by the Roman army
April 12, 467 Anthemius is elevated to Emperor of the Western Roman Empire
April 9, 475 Byzantine Emperor Basiliscus issues a circular letter (Enkyklikon) to the bishops of his empire, supporting the Monophysite christological position
April 11, 491 Flavius Anastasius becomes Byzantine Emperor, with the name of Anastasius I
April 1, 527 Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne
April 1, 528 The daughter of Emperor Xiaoming of Northern Wei was made the "Emperor" as a male heir of the late emperor by Empress Dowager Hu, deposed and replaced by Yuan Zhao the next day; she was the first female monarch in the History of China, but not widely recognised
April 7, 529 First draft of the Corpus Juris Civilis (a fundamental work in jurisprudence) is issued by Eastern Roman Emperor Justinian I
April 19, 531 Battle of Callinicum: A Byzantine army under Belisarius is defeated by the Persian at Ar-Raqqah (northern Syria)
April 9, 537 Siege of Rome: The Byzantine general Belisarius receives his promised reinforcements, 1,600 cavalry, mostly of Hunnic or Slavic origin and expert bowmen. He starts, despite shortages, raids against the Gothic camps and Vitiges is forced into a stalemate
April 23, 599 Maya king Uneh Chan of Calakmul attacks rival city-state Palenque in southern Mexico, defeating queen Yohl Ik'nal and sacking the city
April 7, 611 Maya king Uneh Chan of Calakmul sacks rival city-state Palenque in southern Mexico
April 12, 627 King Edwin of Northumbria is converted to Christianity by Paulinus, bishop of York
April 27, 629 Shahrbaraz is crowned as king of the Sasanian Empire
April 8, 632 King Charibert II is assassinated at Blaye (Gironde)—possibly on orders of his half-brother Dagobert I—along with his infant son Chilperic. He claims Aquitaine and Gascony, becoming the most powerful Merovingian king in the West
April 30, 642 Chindasuinth is proclaimed king by the Visigothic nobility and bishops
April 3, 686 Maya king Yuknoom Yich'aak K'ahk' assumes the crown of Calakmul
April 23, 711 Dagobert III is crowned King of the Franks
April 29, 711 Islamic conquest of Hispania: Moorish troops led by Tariq ibn-Ziyad land at Gibraltar to begin their invasion of the Iberian Peninsula (Al-Andalus)
April 15, 769 The Lateran Council condemned the Council of Hieria and anathematized its iconoclastic rulings
April 25, 775 The Battle of Bagrevand puts an end to an Armenian rebellion against the Abbasid Caliphate. Muslim control over Transcaucasia is solidified and its Islamization begins, while several major Armenian nakharar families lose power and their remnants flee to the Byzantine Empire
April 5, 823 Lothair I is crowned King of Italy by Pope Paschal I
April 10, 837 Halley's Comet makes its closest approach to Earth at a distance equal to 0.0342 AU (5.1 million kilometres/3.2 million miles)
April 8, 876 The Battle of Dayr al-'Aqul saves Baghdad from the Saffarids
April 10, 879 Louis III and Carloman II become joint Kings of the Western Franks
April 21, 900 The Laguna Copperplate Inscription, the earliest known written document found in the Philippines: the Honourable Namwaran and his children, Lady Angkatan and Bukah, are granted pardon from all their debts by the Commander in chief of Tundun, as represented by the Honourable Jayadewa, Lord Minister of Pailah. Luzon, Philippines
April 14, 966 After his marriage to the Christian Dobrawa of Bohemia, the pagan ruler of the Polans, Mieszko I, converts to Christianity, an event considered to be the founding of the Polish state
April 14, 972 Emperor Otto II married Princess Theophano, niece of Byzantine Emperor John Tzimisces, leading to a significant impact on German intellectual life, including interest in Greek literature and Byzantine art
April 19, 1012 Martyrdom of Ælfheah in Greenwich, London
April 23, 1014 Battle of Clontarf: Brian Boru defeats Viking invaders, but is killed in battle
April 23, 1016 Edmund Ironside succeeds his father Æthelred the Unready as king of England