| 43261 | April 14 | Holiday and observance | Day of Mologa (Yaroslavl Oblast, Russia) |
| 43262 | April 14 | Holiday and observance | N'Ko Alphabet Day (Mande speakers) |
| 43263 | April 14 | Holiday and observance | New Year festivals in South and Southeast Asian cultures, celebrated on the sidereal vernal equinox:Bohag Bihu/Rongali Bihu (Assamese New Year), (Assam Valley)Pohela Boishakh (Bengali New Year), (Bangladesh and West Bengal)Thingyan (Burmese New Year)Cambo |
| 43264 | April 14 | Holiday and observance | The first day of Takayama Spring Festival (Takayama, Gifu, Japan) |
| 43265 | April 14 | Holiday and observance | Vaisakhi (Punjab region) |
| 43266 | April 14 | Holiday and observance | Youth Day (Angola) |
| 43267 | April 15 | Event | 769 – The Lateran Council condemned the Council of Hieria and anathematized its iconoclastic rulings. |
| 43268 | April 15 | Event | 1071 – Bari, the last Byzantine possession in southern Italy, is surrendered to Robert Guiscard. |
| 43269 | April 15 | Event | 1395 – Tokhtamysh–Timur war: Battle of the Terek River: Timur defeats Tokhtamysh of the Golden Horde at the Volga. The Golden Horde capital city, Sarai, is razed to the ground and Timur installs a puppet ruler on the Golden Horde throne. Tokhtamysh escape |
| 43270 | April 15 | Event | 1450 – Battle of Formigny: Toward the end of the Hundred Years' War, the French attack and nearly annihilate English forces, ending English domination in Northern France. |
| 43271 | April 15 | Event | 1632 – Battle of Rain: Swedes under Gustavus Adolphus defeat the Holy Roman Empire during the Thirty Years' War. |
| 43272 | April 15 | Event | 1642 – Irish Confederate Wars: A Confederate Irish militia is routed in the Battle of Kilrush when it attempts to halt the progress of a Parliamentarian army. |
| 43273 | April 15 | Event | 1715 – The Pocotaligo Massacre triggers the start of the Yamasee War in colonial South Carolina. |
| 43274 | April 15 | Event | 1738 – Serse, an Italian opera by George Frideric Handel receives its premiere performance in London, England. |
| 43275 | April 15 | Event | 1755 – Samuel Johnson's A Dictionary of the English Language is published in London. |
| 43276 | April 15 | Event | 1783 – Preliminary articles of peace ending the American Revolutionary War (or American War of Independence) are ratified. |
| 43277 | April 15 | Event | 1802 – William Wordsworth and his sister, Dorothy see a "long belt" of daffodils, inspiring the former to pen I Wandered Lonely as a Cloud. |
| 43278 | April 15 | Event | 1817 – Thomas Hopkins Gallaudet and Laurent Clerc founded the American School for the Deaf, the first American school for deaf students, in Hartford, Connecticut. |
| 43279 | April 15 | Event | 1861 – President Abraham Lincoln calls for 75,000 Volunteers to quell the insurrection that soon became the American Civil War |
| 43280 | April 15 | Event | 1865 – President Abraham Lincoln dies after being shot the previous evening by actor John Wilkes Booth. Vice President Andrew Johnson, becomes President upon Lincoln's death. |
| 43281 | April 15 | Event | 1892 – The General Electric Company is formed. |
| 43282 | April 15 | Event | 1896 – Closing ceremony of the Games of the I Olympiad in Athens, Greece. |
| 43283 | April 15 | Event | 1900 – Philippine–American War: Filipino guerrillas launch a surprise attack on U.S. infantry and begin a four-day siege of Catubig, Philippines. |
| 43284 | April 15 | Event | 1907 – Triangle Fraternity is founded at the University of Illinois at Urbana–Champaign |
| 43285 | April 15 | Event | 1912 – The British passenger liner RMS Titanic sinks in the North Atlantic at 2:20 a.m., two hours and forty minutes after hitting an iceberg. Only 710 of 2,227 passengers and crew on board survive. |
| 43286 | April 15 | Event | 1920 – Two security guards are murdered during a robbery in South Braintree, Massachusetts. Anarchists Sacco and Vanzetti would be convicted of and executed for the crime, amid much controversy. |
| 43287 | April 15 | Event | 1921 – Black Friday: Mine owners announce more wage and price cuts, leading to the threat of a strike all across England. |
| 43288 | April 15 | Event | 1922 – U.S. Senator John B. Kendrick of Wyoming introduces a resolution calling for an investigation of a secret land deal, which leads to the discovery of the Teapot Dome scandal. |
| 43289 | April 15 | Event | 1923 – Insulin becomes generally available for use by people with diabetes. |
| 43290 | April 15 | Event | 1924 – Rand McNally publishes its first road atlas. |