Shapur I becomes co-emperor of the Sasanian Empire with his father Ardashir I.📜 ISLAMIC FESTIVALS🌍 GLOBAL🗓️ 12 April 0240Shahanshah of the Sasanian Empire from 240 to 270
Anthemius is elevated to Emperor of the Western Roman Empire.📜 HISTORICAL EVENTS🌍 GLOBAL🗓️ 12 April 0467Western Roman emperor from 467 to 472
King Edwin of Northumbria is converted to Christianity by Paulinus📜 HISTORICAL EVENTS🌍 UNITED KINGDOM🗓️ 12 April 0627King of Deira and Bernicia from 616 to 632/633
Duke Oldřich of Bohemia deposes and blinds his brother Jaromír📜 HISTORICAL EVENTS🌍 GLOBAL🗓️ 12 April 1012Duke of Bohemia from 1012 to 1033 (and briefly in 1034)
Having received the submission of the prince of Antioch📜 CITIES🌍 GLOBAL🗓️ 12 April 1159Ruling monarch of the Principality of Antioch (1098–1268)
The Crusaders of the Fourth Crusade breach the walls of Constantinople and enter the city📜 CITIES🌍 GLOBAL🗓️ 12 April 1204Religious wars of the High Middle Ages
The Union Flag is adopted as the flag of English and Scottish ships.📜 HISTORICAL EVENTS🌍 UNITED KINGDOM🗓️ 12 April 1606Flag of the United Kingdom
American Revolution: With the Halifax Resolves📜 INDIAN ARMY🌍 UNITED STATES🗓️ 12 April 1776Founding of the United States
American Revolution: A Royal Navy fleet led by Admiral George Rodney defeats a French fleet led by the Comte de Grasse at the Battle of the Saintes off Dominica in the Caribbean Sea.📜 WARS🌍 UNITED STATES🗓️ 12 April 1782Naval warfare force of the United Kingdom
War of the First Coalition: Napoleon Bonaparte wins his first victory as an army commander at the Battle of Montenotte📜 INDIAN ARMY🌍 FRANCE🗓️ 12 April 17961792–1797 battles between French revolutionaries and neighbouring monarchies
The Froberg mutiny on Malta ends when the remaining mutineers blow up the magazine of Fort Ricasoli.📜 HISTORICAL EVENTS🌍 UNITED KINGDOM🗓️ 12 April 18071807 mutiny against the British in Malta
Alexander Ypsilantis is declared leader of Filiki Eteria📜 WARS🌍 GLOBAL🗓️ 12 April 1820Greek revolutionary and commander (1792–1828)
Soldiers marching on the Broughton Suspension Bridge in Manchester📜 HISTORICAL EVENTS🌍 GLOBAL🗓️ 12 April 1831Bridge in Manchester, England, completed in 1826
American Civil War: Battle of Fort Sumter. The war begins with Confederate forces firing on Fort Sumter📜 POLITICS🌍 UNITED STATES🗓️ 12 April 18611861–1865 conflict in the United States
American Civil War: The Andrews Raid (the Great Locomotive Chase) occurs📜 INDIAN ARMY🌍 UNITED STATES🗓️ 12 April 18621862 raid during the American Civil War
American Civil War: The Battle of Fort Pillow: Confederate forces kill most of the African American soldiers that surrendered at Fort Pillow📜 HISTORY🌍 UNITED STATES🗓️ 12 April 18641864 battle of the American Civil War
The United Kingdom annexes the Transvaal.📜 CITIES🌍 UNITED KINGDOM🗓️ 12 April 1877Country in northwestern Europe
One day after its enactment by the Congress📜 HISTORICAL EVENTS🌍 UNITED STATES🗓️ 12 April 1900Bicameral legislature of the United States federal government