27th day events in history

November 27, 25 Luoyang is declared capital of the Eastern Han dynasty by Emperor Guangwu of Han
January 27, 98 Trajan succeeded his adoptive father Nerva as Roman emperor; under his rule the Roman Empire would reach its maximum extent
November 27, 176 Emperor Marcus Aurelius grants his son Commodus the rank of "Imperator" and makes him Supreme Commander of the Roman legions
October 27, 312 Constantine the Great is said to have received his famous Vision of the Cross
February 27, 380 Edict of Thessalonica: Emperor Theodosius I, with co-emperors Gratian and Valentinian II, declare their wish that all Roman citizens convert to trinitarian Christianity
April 27, 395 Emperor Arcadius marries Aelia Eudoxia, daughter of the Frankish general Flavius Bauto. She becomes one of the more powerful Roman empresses of Late Antiquity
November 27, 395 Rufinus, praetorian prefect of the East, is murdered by Gothic mercenaries under Gainas
August 27, 410 The sacking of Rome by the Visigoths ends after three days
February 27, 425 The University of Constantinople is founded by Emperor Theodosius II at the urging of his wife Aelia Eudocia
November 27, 511 King Clovis I dies at Paris ("Lutetia") and is buried in the Abbey of St Genevieve. The Merovingian dynasty is continued by his four sons, Theuderic I, Chlodomer, Childebert I and Chlothar I, who divide the Frankish Kingdom and rule from the capitals at Metz, Orléans, Paris and Soissons
December 27, 537 The Hagia Sophia is completed
November 27, 602 Emperor Maurice is forced to watch his five sons be executed before being beheaded himself; their bodies are thrown into the sea and their heads are exhibited in Constantinople
April 27, 629 Shahrbaraz is crowned as king of the Sasanian Empire
January 27, 661 The Rashidun Caliphate ends with the death of Ali
October 27, 710 Saracen invasion of Sardinia
February 27, 907 Abaoji, a Khitan chieftain, is enthroned as Emperor Taizu, establishing the Liao Dynasty in northern China
May 27, 927 Death of Simeon I the Great, the first Bulgarian to be recognized as Emperor
October 27, 939 Æthelstan, the first King of England, died and was succeeded by his half-brother, Edmund I
July 27, 1054 Siward, Earl of Northumbria invades Scotland and defeats Macbeth, King of Scotland somewhere north of the Firth of Forth
September 27, 1066 William the Conqueror and his army set sail from the mouth of the River Somme, beginning the Norman conquest of England
November 27, 1095 Pope Urban II declares the First Crusade at the Council of Clermont
May 27, 1120 Richard III of Capua is anointed as Prince two weeks before his untimely death
January 27, 1142 Song Dynasty General Yue Fei is executed
May 27, 1153 Malcolm IV becomes King of Scotland
August 27, 1172 Henry the Young King and Margaret of France are crowned as junior king and queen of England
January 27, 1186 Henry VI, the son and heir of the Holy Roman Emperor Frederick I, marries Constance of Sicily
July 27, 1189 Friedrich Barbarossa arrives at Niš, the capital of Serbian King Stefan Nemanja, during the Third Crusade
May 27, 1199 John is crowned King of England
July 27, 1202 Georgian-Seljuk wars: At the Battle of Basian the Kingdom of Georgia defeats the Sultanate of Rum
July 27, 1214 Battle of Bouvines: Philip II of France decisively defeats Imperial, English and Flemish armies, effectively ending John of England's Angevin Empire
August 27, 1232 The Formulary of Adjudications is promulgated by Regent Hōjō Yasutoki. (Traditional Japanese date: August 10, 1232)
October 27, 1275 Traditional founding of the city of Amsterdam
April 27, 1296 First War of Scottish Independence: John Balliol's Scottish army is defeated by an English army commanded by John de Warenne, 6th Earl of Surrey at the Battle of Dunbar
July 27, 1299 According to Edward Gibbon, Osman I invades the territory of Nicomedia for the first time, usually considered to be the founding day of the Ottoman state
January 27, 1302 Dante Alighieri, the poet and politician is exiled from Florence, Italy, where he served as one of six priors governing the city
July 27, 1302 Battle of Bapheus: Decisive Ottoman victory over the Byzantines opening up Bithynia for Turkish conquest
March 27, 1309 Pope Clement V imposes excommunication, interdiction, and a general prohibition of all commercial intercourse against Venice, which had unjustly seized on Ferrara, a fief of the Patrimony of Peter
March 27, 1329 Pope John XXII issues his In Agro Dominico condemning some writings of Meister Eckhart as heretical
September 27, 1331 The Battle of Płowce between the Kingdom of Poland and the Teutonic Order is fought
January 27, 1343 Pope Clement VI issues the papal bull Unigenitus to justify the power of the pope and the use of indulgences. Nearly 200 years later, Martin Luther would protest this
June 27, 1358 Republic of Dubrovnik is founded
September 27, 1422 After the brief Gollub War the Teutonic Knights sign the Treaty of Melno with the Kingdom of Poland and Grand Duchy of Lithuania
June 27, 1497 Cornish rebels Michael An Gof and Thomas Flamank are executed at Tyburn, London, England
April 27, 1509 Pope Julius II places the Italian state of Venice under interdict
December 27, 1512 The Spanish Crown issues the Laws of Burgos, governing the conduct of settlers with regard to native Indians in the New World
March 27, 1513 Spanish explorer Juan Ponce de León reaches the northern end of The Bahamas on his first voyage to Florida
April 27, 1521 Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu
April 27, 1522 Combined forces of Spain and the Papal States defeat a French and Venetian army at the Battle of Bicocca
October 27, 1524 Italian Wars: The French troops lay siege to Pavia
September 27, 1529 The Siege of Vienna begins when Suleiman I attacks the city