Notable Historical Dates On This Day September 21st

From world-changing moments to lesser-known milestones, history is happening all around us—every single day. Explore the key events that shaped the world on this very date, and uncover the fascinating stories that connect the past to today.

Politics & Government

Avitus Consolidates Power in Italy

September 21st, 455 1570 years ago

Avitus, a former military general, entered Italy at the head of a Gallic army. Following his declaration as emperor by the troops, he aimed to establish stability and consolidate authority amidst a turbulent political landscape. His march into the Italian heartland marked a significant assertion of power, as he sought to strengthen ties with closer allies and address the unrest destabilizing the Roman Empire.

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Military & Warfare

Fall of Dublin to Anglo-Norman Forces

September 21st, 1170 855 years ago

The Kingdom of Dublin fell to Anglo-Norman invaders led by Richard de Clare, known as Strongbow. This pivotal conflict marked a significant shift in power dynamics within Ireland. Following a series of alliances and military actions, Strongbow and his troops successfully captured Dublin, overcoming both the city's defenses and the Irish forces loyal to the local king, Roderic O'Connor. This event established Anglo-Norman influence in Ireland, paving the way for further invasions and settlement by Norman lords.

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Military & Warfare

Lembitu and Caupo Killed at Battle

September 21st, 1217 808 years ago

Lembitu, the leader of the Estonians, and Caupo of Turaida, a Livonian leader, were killed in a battle known as the Battle of St. Matthew's Day. The conflict arose during the Livonian Crusade, a crusade aimed at converting the pagan peoples of the region. The battle was significant for its high-profile casualties that symbolized the fierce resistance of the local Estonian populace against foreign domination by the Livonians and their allies.

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Politics & Government

Burgundy Shifts Allegiance in the Hundred Years' War

September 21st, 1435 590 years ago

The Treaty of Arras, finalized on September 21, 1435, led to a notable realignment of allegiances during the Hundred Years' War. Significantly, Philip the Good, the Duke of Burgundy, officially broke ties with England, aligning his province with France. This shift was facilitated by the negotiation efforts of French King Charles VII and marks a turning point in the conflict, influencing the balance of power in Northern France. The treaty aimed to stabilize the region and assert French authority amidst ongoing English invasions.

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Military & Warfare

Quick Defeat of British by Jacobite Forces

September 21st, 1745 280 years ago

A British government army, commanded by Sir John Cope, faced a swift and decisive defeat at the hands of the Jacobite forces led by Prince Charles Edward Stuart. This encounter took place near Prestonpans in Scotland, where Cope’s troops were caught off guard and overwhelmed within a mere fifteen minutes. The Jacobite army, although less equipped and less numerous, utilized strategic surprise and effective leadership to achieve this stunning victory.

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Military & Warfare

British Forces Occupy and Burn New York City

September 21st, 1776 249 years ago

Shortly after British forces occupied New York City, parts of the city were set aflame. This occurred amidst the larger context of the American Revolutionary War, as the British sought to establish control over the rebellious colonies. The fire caused significant destruction and chaos and has often been scrutinized regarding its origins and the motives behind it. Subsequent evaluations of the damage highlighted the vulnerability of the city in times of war.

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Military & Warfare

Benedict Arnold Betrays American Forces

September 21st, 1780 245 years ago

Benedict Arnold, a former American general, provided British forces with critical fortification plans for West Point, a strategic location on the Hudson River, after secretly transferring his allegiance to the Crown. This act of treason aimed to deliver a significant military advantage to the British during the American Revolutionary War. His betrayal was a significant blow to the American cause, exposing vulnerabilities in their defensive arrangements.

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Politics & Government

National Convention Abolishes the Monarchy

September 21st, 1792 233 years ago

The National Convention in France abolished the monarchy, marking a significant turn in the revolution. This decision stemmed from a belief that the monarchy was incompatible with the principles of liberty and democracy. Following the execution of King Louis XVI, the convention sought to establish a republic, reflecting the desires of a populace increasingly disillusioned by monarchical rule. The abolition was widely celebrated among revolutionaries as a pivotal victory for revolutionary ideals and garnered both domestic and international attention.

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Politics & Government

Castlereagh and Canning's Duel at Putney Heath

September 21st, 1809 216 years ago

British Secretary of War Lord Castlereagh and Foreign Secretary George Canning met in a duel on Putney Heath, resulting in Castlereagh wounding Canning in the thigh. The duel was fueled by political tensions between the two men, who were prominent figures in the British government. Disagreements over foreign policy and personal animosities led to this confrontation, where honor was deemed at stake.

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Exploration & Discovery

Chilean Government Claims Strait of Magellan

September 21st, 1843 182 years ago

Led by Captain John Williams Wilson, the crew of the schooner Ancud sailed into the Strait of Magellan, claiming the territory for Chile. This pivotal act was aimed at asserting Chilean sovereignty over the southernmost point of South America, which had strategic importance for trade and navigation. The Chilean government sought to reinforce its presence in the region in order to compete with other nations, especially Argentina, which also laid claim to parts of Patagonia. The crew's actions marked a significant step in the geopolitical landscape of the time.

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Military & Warfare

Anglo-French Forces Triumph at Palikao

September 21st, 1860 165 years ago

The Battle of Palikao was a significant conflict during the Second Opium War, taking place near Beijing. An Anglo-French coalition, primarily comprising British and French troops, launched a well-coordinated assault against Qing Dynasty forces. This battle marked a crucial point in the war, demonstrating the superiority of Western military tactics and technology over traditional Chinese defenses. The outcome of the battle led to the eventual capture of Beijing, escalating the conflict and leading to significant concessions from the Qing government.

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Military & Warfare

Ever Victorious Army Defeats Taiping Forces

September 21st, 1862 163 years ago

In September 1862, the Ever Victorious Army engaged Taiping forces in Cixi, showcasing their growing military prowess. The battle illustrated the strategic effectiveness of Qing China's foreign-trained troops. Under the command of Frederick Townsend Ward, the army successfully overcame the Taiping rebels, consolidating their influence in the region. This clash was emblematic of the larger conflict between the Qing dynasty and the Taiping rebellion, which had engulfed China since 1850.

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