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May 15

221 – Liu Bei, Chinese warlord, proclaims himself emperor of Shu Han, the successor of the Han dynasty. 392 – Emperor Valentinian II is assassinated while advancing into Gaul against the Frankish usurper Arbogast. He is found hanging in his residence at Vienne. 589 – King Authari marries Theodelinda, daughter of the Bavarian duke Garibald I. A Catholic, she has great influence among the Lombard nobility. 756 – Abd al-Rahman I, the founder of the Arab dynasty that ruled the greater part of Iberia for nearly three centuries, becomes emir of Cordova, Spain. 1252 – Pope Innocent IV issues the papal bull ad extirpanda, which authorizes, but also limits, the torture of heretics in the Medieval Inquisition. 1525 – Insurgent peasants led by Anabaptist pastor Thomas Müntzer were defeated at the Battle of Frankenhausen, ending the German Peasants' War in the Holy Roman Empire. 1536 – Anne Boleyn, Queen of England, stands trial in London on charges of treason, adultery and incest; she is condemned to death by a specially-selected jury. 1602 – Cape Cod is sighted by English navigator Bartholomew Gosnold. 1618 – Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made). 1648 – The Peace of Münster is ratified, by which Spain acknowledges Dutch sovereignty. 1791 – French Revolution: Maximilien Robespierre proposes the Self-denying Ordinance. 1817 – Opening of the first private mental health hospital in the United States, the Asylum for the Relief of Persons Deprived of the Use of Their Reason (now Friends Hospital, Philadelphia, Pennsylvania). 1836 – Francis Baily observes "Baily's beads" during an annular eclipse. 1849 – The Sicilian revolution of 1848 is finally extinguished. 1850 – The Arana–Southern Treaty is ratified, ending "the existing differences" between Great Britain and Argentina. 1851 – The first Australian gold rush is proclaimed, although the discovery had been made three months earlier.

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Related concepts (16)
May 14
1027 – Robert II of France names his son Henry I as junior King of the Franks. 1097 – The Siege of Nicaea begins during the First Crusade. 1264 – Battle of Lewes: Henry III of England is captured and forced to sign the Mise of Lewes, making Simon de Montfort the effective ruler of England. 1509 – Battle of Agnadello: In northern Italy, French forces defeat the Republic of Venice. 1607 – English colonists establish "James Fort," which would become Jamestown, Virginia, the earliest permanent English settlement in the Americas.
June 11
173 – Marcomannic Wars: The Roman army in Moravia is encircled by the Quadi, who have broken the peace treaty (171). In a violent thunderstorm emperor Marcus Aurelius defeats and subdues them in the so-called "miracle of the rain". 631 – Emperor Taizong of Tang sends envoys to the Xueyantuo bearing gold and silk in order to seek the release of Chinese prisoners captured during the transition from Sui to Tang. 786 – A Hasanid Alid uprising in Mecca is crushed by the Abbasids at the Battle of Fakhkh.
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.
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