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May 12

254 – Pope Stephen I succeeds Pope Lucius I, becoming the 23rd pope of the Catholic Church, and immediately takes a stand against Novatianism. 907 – Zhu Wen forces Emperor Ai into abdicating, ending the Tang dynasty after nearly three hundred years of rule. 1191 – Richard I of England marries Berengaria of Navarre in Cyprus; she is crowned Queen consort of England the same day. 1328 – Antipope Nicholas V, a claimant to the papacy, is consecrated in Rome by the Bishop of Venice. 1364 – Jagiellonian University, the oldest university in Poland, is founded in Kraków. 1497 – Pope Alexander VI excommunicates Girolamo Savonarola. 1510 – The Prince of Anhua rebellion begins when Zhu Zhifan kills all the officials invited to a banquet and declares his intent on ousting the powerful Ming dynasty eunuch Liu Jin during the reign of the Zhengde Emperor. 1551 – National University of San Marcos, the oldest university in the Americas, is founded in Lima, Peru. 1588 – French Wars of Religion: Henry III of France flees Paris after Henry I, Duke of Guise, enters the city and a spontaneous uprising occurs. 1593 – London playwright Thomas Kyd is arrested and tortured by the Privy Council for libel. 1743 – Maria Theresa of Austria is crowned Queen of Bohemia after defeating her rival, Charles VII, Holy Roman Emperor. 1778 – Heinrich XI, count of the Principality of Reuss-Greiz, is elevated to Prince by Joseph II, Holy Roman Emperor. 1780 – American Revolutionary War: In the largest defeat of the Continental Army, Charleston, South Carolina is taken by British forces. 1797 – War of the First Coalition: Napoleon Bonaparte conquers Venice. 1808 – Finnish War: Swedish-Finnish troops, led by Captain Karl Wilhelm Malmi, conquer the city of Kuopio from Russians after the Battle of Kuopio. 1821 – The first major battle of the Greek War of Independence against the Turks is fought in Valtetsi. 1846 – The Donner Party of pioneers departs Independence, Missouri for California, on what will become a year-long journey of hardship and cannibalism.

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Related concepts (17)
July 15
484 BC – Dedication of the Temple of Castor and Pollux in ancient Rome 70 – First Jewish–Roman War: Titus and his armies breach the walls of Jerusalem. (17th of Tammuz in the Hebrew calendar). 756 – An Lushan Rebellion: Emperor Xuanzong of Tang is ordered by his Imperial Guards to execute chancellor Yang Guozhong by forcing him to commit suicide or face a mutiny. General An Lushan has other members of the emperor's family killed. 1099 – First Crusade: Christian soldiers take the Church of the Holy Sepulchre in Jerusalem after the final assault of a difficult siege.
1892
In Samoa, this was the only leap year spanned to 367 days as July 4 repeated. This means that the International Date Line was drawn from the east of the country to go west. January 1 – Ellis Island begins accommodating immigrants to the United States. February 1 – The historic Enterprise Bar and Grill is established in Rico, Colorado. February 27 – Rudolf Diesel applies for a patent, on his compression ignition engine (the Diesel engine). February 29 – St. Petersburg, Florida is incorporated as a town.
1900
As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 13 days until February 28 (O.S. February 15), 2100. The year 1900 also marked the Year of the Rat on the Chinese calendar. January 1900 January 2 – U.S. Secretary of State John Hay announces the Open Door Policy, to promote American trade with China. January 3 – The United States Census estimates the country's population to be about 70 million people.
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