April 15

Norman forces under Robert Guiscard capture Bari, ending the last Byzantine holdings in southern Italy.

Norman adventurer Robert Guiscard captured the city of Bari after a lengthy siege, ending the last remaining Byzantine territorial holdings in southern Italy and completing the Norman conquest of the region. The victory established Norman rule over southern Italy, a kingdom that later blended Norman, Byzantine, and Arab administrative and cultural influences in distinctive ways.

Swedish forces under King Gustavus Adolphus defeat the Holy Roman Empire at the Battle of Rain during the Thirty Years' War.

Swedish King Gustavus Adolphus led his forces to a decisive victory over Bavarian and Imperial troops at the Battle of Rain during the Thirty Years' War, a conflict that devastated much of Central Europe. The victory opened Bavaria to Swedish invasion and further cemented Gustavus Adolphus's reputation as one of the era's most innovative and successful military commanders.

Samuel Johnson's comprehensive "Dictionary of the English Language" is published in London.

English writer Samuel Johnson published his monumental "Dictionary of the English Language" after nine years of painstaking work, largely completed single-handedly, defining over 40,000 words with illustrative literary quotations. Though later superseded by more comprehensive dictionaries, Johnson's work remained the preeminent English dictionary for over a century and set new standards for lexicography.

The American School for the Deaf is established in Hartford, Connecticut, the first permanent school for deaf students in the United States.

Thomas Hopkins Gallaudet and Laurent Clerc founded the American School for the Deaf in Hartford, Connecticut, the first permanent institution in the United States dedicated to educating deaf students. The school played a foundational role in developing American Sign Language and establishing deaf education as a recognized field in the country.

President Abraham Lincoln calls for 75,000 militiamen to suppress the Southern rebellion, escalating the Civil War.

Following the Confederate attack on Fort Sumter days earlier, President Abraham Lincoln issued a proclamation calling for 75,000 state militia volunteers to suppress what he termed an insurrection, a move that prompted several additional Southern states to secede rather than supply troops against fellow Southerners.

President Abraham Lincoln dies from the gunshot wound inflicted the previous night by John Wilkes Booth.

President Abraham Lincoln died in the early morning hours at a boarding house across from Ford's Theatre, having never regained consciousness after being shot by John Wilkes Booth the previous night. His death, coming just days after the Confederacy's collapse, plunged the nation into mourning and complicated the already difficult questions surrounding postwar Reconstruction.

The RMS Titanic sinks in the North Atlantic after striking an iceberg, killing over 1,500 of the roughly 2,224 people aboard.

The RMS Titanic sank in the frigid North Atlantic in the early morning hours after striking an iceberg the previous night, with a shortage of lifeboats contributing to the deaths of more than 1,500 of the roughly 2,224 passengers and crew aboard. The disaster prompted sweeping international reforms to maritime safety regulations, including lifeboat capacity requirements still in use today.

Jackie Robinson makes his major league debut with the Brooklyn Dodgers, breaking baseball's color barrier.

Jackie Robinson took the field for the Brooklyn Dodgers at Ebbets Field, becoming the first Black player in modern Major League Baseball and breaking a color barrier that had excluded Black athletes from the sport's top level for decades. Robinson endured intense racist hostility with remarkable composure, and his achievement became a landmark moment in the broader civil rights movement.

A fatal crowd crush at Hillsborough Stadium in Sheffield, England, kills 97 Liverpool football fans.

A fatal crush developed among Liverpool fans in an overcrowded standing terrace at Hillsborough Stadium in Sheffield, England, before an FA Cup semifinal, ultimately killing 97 people. Years of official mischaracterization blaming fan behavior were eventually overturned following prolonged campaigning by victims' families, leading to a 2016 inquest ruling that police failures caused the disaster.

A major fire severely damages the Notre-Dame de Paris cathedral, destroying its spire and roof.

A major fire broke out in the attic of Notre-Dame de Paris, the iconic medieval Gothic cathedral, ultimately collapsing its spire and destroying most of its wooden roof structure before firefighters brought the blaze under control. The fire, watched in real time by shocked crowds and a global television audience, prompted an outpouring of donations toward the cathedral's extensive, years-long restoration.