April 24

Mary, Queen of Scots marries the French Dauphin, later King Francis II, at Notre-Dame de Paris.

The teenage Mary, Queen of Scots, married the French Dauphin, who would briefly become King Francis II the following year, in an elaborate ceremony at Notre-Dame de Paris intended to strengthen the alliance between Scotland and France. The marriage was part of a broader political strategy amid ongoing tensions between Scotland, France, and England.

The Boston News-Letter begins publication, generally regarded as the first regularly published newspaper in British colonial America.

The Boston News-Letter began publication under printer John Campbell, generally regarded by historians as the first successfully sustained newspaper in Britain's American colonies, providing readers with a mix of local announcements and reprinted news from Europe. Its establishment marked an early step in the development of colonial American journalism.

President John Adams approves funding to establish the Library of Congress.

President John Adams signed legislation appropriating $5,000 to purchase books needed by Congress as it prepared to relocate to the new capital city of Washington, establishing what became the Library of Congress. The institution has since grown into one of the largest libraries in the world, serving both Congress and the American public.

Russia declares war on the Ottoman Empire, beginning the Russo-Turkish War.

The Russian Empire declared war on the Ottoman Empire, launching the Russo-Turkish War, fought partly in support of Balkan Christian populations seeking independence from Ottoman rule. The war's outcome led to significant territorial changes in the Balkans, including greater autonomy or independence for several nations, though it also drew concerned intervention from other European powers.

The Woolworth Building opens in New York City, briefly becoming the tallest building in the world.

The Woolworth Building, an ornate Gothic-style skyscraper financed by five-and-dime retail magnate Frank Woolworth, opened in Lower Manhattan, briefly becoming the tallest building in the world at 792 feet. Dubbed the "Cathedral of Commerce," it remained an iconic feature of the New York skyline for decades.

Irish republicans launch the Easter Rising in Dublin, proclaiming an independent Irish Republic.

Irish republican rebels seized key locations across Dublin and proclaimed an independent Irish Republic in the Easter Rising, an armed insurrection against British rule that was militarily crushed within a week but whose leaders' subsequent execution by British authorities significantly galvanized Irish public support for full independence.

The first tank-versus-tank combat in history occurs at the Battle of Villers-Bretonneux during World War I.

British and German tanks engaged each other directly for the first time in military history at the Battle of Villers-Bretonneux in France, a small but historically significant clash that marked the emergence of tank-versus-tank combat as a feature of modern warfare, foreshadowing armored warfare's central role in future conflicts.

Winston Churchill is knighted by Queen Elizabeth II.

Former British Prime Minister Winston Churchill was formally knighted by Queen Elizabeth II in recognition of his wartime leadership and decades of public service, becoming Sir Winston Churchill. Already one of the most celebrated statesmen of the 20th century, the honor further cemented his legacy as Britain's iconic wartime leader.

Soviet cosmonaut Vladimir Komarov is killed when his Soyuz 1 spacecraft crashes on reentry, becoming the first human to die during a spaceflight.

Soviet cosmonaut Vladimir Komarov was killed when his Soyuz 1 spacecraft's parachute system failed during reentry after a mission plagued by technical problems, making him the first human to die during an actual spaceflight. His death, following mounting known issues with the spacecraft that were reportedly overridden for political reasons, prompted a significant overhaul of Soviet spaceflight safety procedures.

The Hubble Space Telescope is launched into orbit aboard Space Shuttle Discovery.

The Hubble Space Telescope was launched into low Earth orbit aboard Space Shuttle Discovery, beginning a mission that, despite early problems with a flawed mirror later corrected by astronauts, went on to produce some of the most significant astronomical images and discoveries in the history of space science.