May 22

King John of England and King Philip II of France sign the Treaty of Le Goulet.

The treaty settled territorial disputes following the death of Richard I, with Philip recognizing John as the rightful heir to Richard's continental possessions, including Normandy and Anjou, in exchange for John acknowledging Philip as his feudal overlord for those lands. The peace proved short-lived; renewed conflict within a few years eventually stripped John of most of his French territories.

Pope Gregory XI issues five papal bulls condemning the teachings of English theologian John Wycliffe.

Wycliffe, an Oxford theologian, had challenged papal authority, church wealth, and doctrines such as transubstantiation, arguing scripture should be accessible in the vernacular. The bulls ordered English authorities to investigate and silence him, but Wycliffe retained influential protectors and continued his work, later inspiring the Lollard movement and an early English translation of the Bible.

The First Battle of St Albans opens England's decades-long Wars of the Roses.

The First Battle of St Albans, a brief but bloody armed clash between rival noble factions loyal to the houses of York and Lancaster, opened decades of intermittent and destructive dynastic conflict in England that later became known as the Wars of the Roses.

Richard, Duke of York, defeats and captures King Henry VI at the First Battle of St Albans, opening the Wars of the Roses.

The clash in the streets of St Albans was the first pitched battle of the decades-long dynastic struggle between the houses of Lancaster and York for the English throne. Though relatively small in scale, it set a precedent for settling political disputes through armed conflict and began a cycle of civil war that would convulse England for the next thirty years.

Spanish forces massacre Aztec nobles during the festival of Tóxcatl in Tenochtitlan, a turning point in the Spanish conquest of Mexico.

Spanish conquistadors under Pedro de Alvarado, acting in Hernán Cortés's temporary absence, massacred unarmed Aztec nobles gathered for a sanctioned religious festival honoring the god Tezcatlipoca in Tenochtitlan, an unprovoked atrocity that shattered any remaining trust between the Spanish and the Aztec Empire and accelerated the conquest's violent final phase.

The Trevi Fountain is officially completed and inaugurated in Rome.

The Trevi Fountain, one of Rome's most elaborate and celebrated Baroque monuments, was officially completed and inaugurated after decades of design revisions and construction, drawing its water supply from the ancient Aqua Virgo aqueduct that had continued functioning after over two thousand years of continuous use.

The Lewis and Clark Expedition formally departs from St. Charles, Missouri, to explore the newly acquired Louisiana Territory.

The Lewis and Clark Expedition formally departed from St. Charles, Missouri, beginning its ambitious multi-year journey commissioned by President Thomas Jefferson to explore, map, and scientifically catalog the vast, newly acquired Louisiana Territory and search for a practical water route to the Pacific Ocean.

A mob in Littleport, Cambridgeshire, England, riots over high unemployment and rising grain prices.

Fueled by post-Napoleonic War economic distress, poor harvests, and unpopular Corn Laws that kept grain prices artificially high, rioters looted homes and attacked property before the unrest spread briefly to nearby Ely. Troops were called in to restore order, and the ensuing trials resulted in five men being hanged, making it one of the harshest responses to rural unrest in Georgian England.

The SS Savannah departs Georgia on a voyage that makes it the first steamship to cross the Atlantic Ocean.

The SS Savannah departed the port of Savannah, Georgia, on a voyage that made it the first steam-powered vessel to successfully cross the Atlantic Ocean, though it relied primarily on conventional sail power for the vast majority of the twenty-nine day journey, using its auxiliary steam engine only sparingly.

HMS Beagle departs England on its first survey voyage.

Commanded initially by Pringle Stokes, the Royal Navy vessel set out to chart the coastline of South America, part of a broader British effort to survey global waters for navigation and trade. The ship's fame rests chiefly on its second voyage a few years later, when a young naturalist named Charles Darwin sailed aboard and gathered observations that would shape his theory of evolution.

The British government abolishes the penal transportation of convicts to the New South Wales colony.

Since 1788, Britain had shipped tens of thousands of convicted criminals to Australia as a means of easing overcrowded prisons and populating its new colony. Growing opposition within both Britain and the colony itself, over the system's social costs and its stigma, led authorities to end transportation to New South Wales, though it continued to other Australian colonies for several more decades.

The Wright brothers are granted a U.S. patent for their flying machine.

The Wright brothers, Orville and Wilbur, were formally granted a U.S. patent for their pioneering "Flying-Machine" design after a lengthy application process, officially recognizing the innovative three-axis wing-warping control system that had enabled their historic first successful powered, controlled flights at Kitty Hawk years earlier.

Three trains collide in the Quintinshill rail disaster near Gretna Green, Scotland, killing 227 people.

A troop train carrying soldiers of the Royal Scots collided with a stationary local train after signalmen failed to notice it on the line, and the wreckage was then struck by a fast express train, igniting a fire fed by gas lighting in the old wooden carriages. Most of the dead were soldiers bound for Gallipoli, making it the deadliest rail disaster in British history.

British troops capture Fallujah during the Anglo-Iraqi War.

The brief conflict erupted after a pro-Axis government seized power in Iraq and besieged the British air base at Habbaniya. British and Commonwealth forces advanced from Palestine and Transjordan, taking Fallujah as a staging point on the road to Baghdad. The campaign's swift success secured Britain's vital oil interests and communications routes in the Middle East during the Second World War.

A magnitude 9.5 earthquake strikes Chile, the most powerful earthquake ever recorded.

A magnitude 9.5 earthquake struck off the coast of Chile near Valdivia, the most powerful earthquake ever instrumentally recorded anywhere in the world, triggering devastating tsunamis that caused significant destruction and loss of life not only locally but also as far away across the Pacific in Hawaii, Japan, and the Philippines.

The first Rugby World Cup kicks off in New Zealand and Australia.

The first Rugby World Cup kicked off, co-hosted jointly by New Zealand and Australia, with the host All Blacks ultimately winning the inaugural tournament on home soil, launching what became one of the most prestigious and widely watched quadrennial championships in international sport.

Fusilier Lee Rigby is murdered by two Islamist extremists near Woolwich Barracks in southeast London.

Rigby, an off-duty British Army soldier, was run down by a car and then attacked with knives and a cleaver on a public street in broad daylight. The perpetrators, who claimed the killing was retaliation for British military action abroad, remained at the scene making statements to bystanders until police arrived. The murder prompted national debate over extremism and security policy in the UK.

Ireland becomes the first country to legalize same-sex marriage through a national public referendum.

Ireland became the first country in the world to legalize same-sex marriage through a direct national popular referendum rather than legislative or judicial action, with citizens voting decisively in favor by a wide margin in a result celebrated internationally as a landmark, culturally significant moment for LGBTQ rights.

A suicide bombing at an Ariana Grande concert in Manchester, England, kills 22 people.

A suicide bomber detonated an improvised explosive device packed with shrapnel in the foyer of Manchester Arena following an Ariana Grande concert, killing 22 people, many of them children and teenagers along with their parents, in one of the deadliest terrorist attacks in recent British history.

A suicide bomber kills 22 people at an Ariana Grande concert in the Manchester Arena bombing.

The attacker detonated a homemade explosive packed with shrapnel in the arena's foyer as concertgoers, many of them children and teenagers, were leaving the show. It was the deadliest terrorist attack in the UK since the 2005 London bombings, prompting a nationwide security review and an outpouring of solidarity across Manchester and the country.