WHAT HAPPENED ON 20. SEPTEMBER
Want to find out what all happened on 20. September

Greeks defeat Persians in the Battle of Salamis (20. September 480. BC)

Muhammad and Abu Bakr arrived Medina (20. September 622)

Agnes de Poitou and Andrew I of Hungary meet to negotiate about the border-zone in present-day Burgenland. (20. September 1058)

Battle of Fulford, Viking Harold Hardrada defeats earls Morcar and Edwin (both died in the battle) (20. September 1066)

Saladin begins the Siege of Jerusalem. (20. September 1187)

The Great Prussian Uprising among the old Prussians begins against the Teutonic Knights. (20. September 1260)

Cardinal Robert of Geneva, called by some the "Butcher of Cesena", is elected as Avignon Pope Clement VII, beginning the Papal schism. (20. September 1378)

The 1498 Meiō Nankaidō earthquake generates a tsunami that washes away the building housing the statue of the Great Buddha at Kōtoku-in in Kamakura, Kanagawa, Japan; since then the Buddha has sat in the open air. (20. September 1498)

Ferdinand Magellan sets sail from Sanlúcar de Barrameda with about 270 men on his expedition to circumnavigate the globe. (20. September 1519)

Diego de Montemayor founds the city of Monterrey in New Spain. (20. September 1596)

The Treaty of Rijswijk is signed by France, England, Spain, the Holy Roman Empire and the Dutch Republic ending the Nine Years' War (1688–97). (20. September 1697)

The finish of the Walking Purchase which forces the cession of 1.2 million acres (4,860 km²) of Lenape-Delaware tribal land to the Pennsylvania Colony. (20. September 1737)

French troops stop allied invasion of France, during the War of the First Coalition at Valmy. (20. September 1792)

Ragamuffin rebels capture Porto Alegre, then capital of the Brazilian imperial province of Rio Grande do Sul, triggering the start of ten-year-long Ragamuffin War. (20. September 1835)

The American Association for the Advancement of Science is created. (20. September 1848)

Battle of Alma: British and French troops defeat Russians in the Crimea. (20. September 1854)

The Indian Rebellion of 1857 ends with the recapture of Delhi by troops loyal to the East India Company. (20. September 1857)

The Prince of Wales (later King Edward VII of the United Kingdom) visits the United States. (20. September 1860)

American Civil War: The Battle of Chickamauga ends. (20. September 1863)

Bersaglieri corps enter Rome through the Porta Pia and complete the unification of Italy. (20. September 1870)