April 01
Overview
Holidays & Observances
Christianfeast day:
Cellach of Armagh, Hugh of Grenoble, Frederick Denison Maurice(Church of England), Mary of Egypt, Melito of Sardis, Tewdrig, Theodora, Walric, abbot of Leuconay, April 1 (Eastern Orthodox liturgics)
A collection of Christian feast days celebrated on April 1 by various churches, honoring saints such as Cellach of Armagh, Mary of Egypt, and Melito of Sardis.
April Fools' Day
A playful day of pranks and humorous hoaxes celebrated worldwide on April 1.
Odisha Day(Odisha,India)
Odisha Day marks the formation of the Indian state of Odisha on April 1, 1936, celebrating its unique heritage and culture.
Arbor Day(Tanzania)
Arbor Day in Tanzania dedicates April 1 to tree planting and environmental conservation efforts across the nation.
Civil Service Day(Thailand)
Civil Service Day in Thailand honors the dedication and achievements of government employees on April 1.
Cyprus National Day(Cyprus)
Cyprus National Day commemorates the 1955 beginning of the EOKA struggle for independence from British rule on April 1.
Edible Book Day
Edible Book Day invites creativity by celebrating literature through deliciously crafted edible art on April 1.
Fossil Fools Day
Fossil Fools Day highlights the environmental impact of fossil fuels and promotes sustainable energy solutions.
Kha b-Nisan, the Assyrian New Year (Assyrian people)
Kha b-Nisan celebrates the Assyrian New Year with vibrant parades, traditional dances, and cultural rituals on April 1.
Events
Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne.
On April 1, 527, Emperor Justin I elevated his nephew Justinian I to the role of co-ruler, securing the imperial succession.
Alexios I Komnenos overthrows the Byzantine emperor Nikephoros III Botaneiates, and, after his troops spend three days extensively looting Constantinople, is formally crowned on April 4.
On April 1, 1081, Alexios I Komnenos launched a revolt, deposing Emperor Nikephoros III Botaneiates and paving the way for the Komnenian dynasty.
In the Eighty Years' War, the Watergeuzen capture Brielle from the Seventeen Provinces, gaining the first foothold on land for what would become the Dutch Republic.
On April 1, 1572, Dutch rebel forces known as the Watergeuzen seized the port of Brielle, marking a pivotal moment in the revolt against Spanish rule.
J. S. Bach's later Easter Oratorio in its first version is performed at the Nikolaikirche in Leipzig on Easter Sunday.
On Easter Sunday 1725, Johann Sebastian Bach premiered the original version of his Easter Oratorio at the Nikolaikirche in Leipzig.
In New York City, the United States House of Representatives achieves its first quorum and elects Frederick Muhlenberg of Pennsylvania as its first Speaker.
On April 1, 1789, the newly formed U.S. House of Representatives met its first quorum in New York City and elected Frederick Muhlenberg as its inaugural Speaker.
The Convention of 1833, a political gathering of settlers in Mexican Texas to help draft a series of petitions to the Mexican government, begins in San Felipe de Austin.
On April 1, 1833, settlers in Mexican Texas assembled at San Felipe de Austin to draft petitions aimed at reforming local governance in Mexico.
American Civil War: Union troops led by Philip Sheridan decisively defeat Confederate troops led by George Pickett, cutting the Army of Northern Virginia's last supply line during the Siege of Petersburg.
On April 1, 1865, Union forces under General Philip Sheridan struck a critical blow to Confederate supply lines, hastening the fall of Petersburg.
Singapore becomes a British crown colony.
On April 1, 1867, Singapore was designated a British crown colony, placing it under direct rule of the British Crown instead of the East India Company.
The White Star steamer SS Atlantic sinks off Nova Scotia, killing 547 in one of the worst marine disasters of the 19th century.
On April 1, 1873, the SS Atlantic of the White Star Line sank off the coast of Nova Scotia, resulting in the loss of 547 lives.
Births
Emperor Go-Saga was the 88th emperor of Japan who ruled in the mid-13th century.
Louis IV
Louis IV was Holy Roman Emperor from 1328 until his death in 1347.
Blanche of France
Blanche of France was a French princess who became Duchess of Orléans in the 14th century.
François de Bonne
François de Bonne was a French Huguenot military leader who became Constable of France.
William Harvey
William Harvey was an English physician who first described the systemic circulation of blood.
Charles de Saint-Évremond
Charles de Saint-Évremond was a French soldier turned essayist celebrated for his wit.
Jean-Henri d'Anglebert
Jean-Henri d'Anglebert was a French Baroque organist and composer known for his keyboard works.
Georg Mohr
Georg Mohr was a Danish mathematician best known for the Mohr–Mascheroni theorem on compass-only constructions.
John Wilmot
John Wilmot was an English Restoration courtier and poet known for his biting wit and libertine lifestyle.
Deaths
John XV
Pope of the Catholic Church from 985 until his death in 996.
Shen Zong
Emperor of the Song dynasty who reigned from 1067 to 1085.
Hugh of Châteauneuf
French bishop of Grenoble and reformer of monastic life, later canonized as a saint.
Eleanor of Aquitaine
Duchess of Aquitaine and queen consort of France and England, one of the most powerful women of the Middle Ages.
Amalric II
King of Cyprus from 1194 and King of Jerusalem from 1197, instrumental in defending the Crusader states.
Abaqa Khan
Second ruler of the Mongol Ilkhanate in Persia, noted for diplomatic efforts with Europe and military campaigns against the Mamluks.
Nuno Álvares Pereira
Commander who secured Portugal’s independence during the 1383–1385 crisis and later became a saint.
Blanche I
Queen regnant of Navarre and consort of Sicily, known for her dynastic alliances and political acumen.
Zbigniew Oleśnicki
Poland’s first cardinal who was a powerful royal advisor and advocate for the Polish-Lithuanian union.