September 20 is the 263rd day of the year (264th in leap years) in the Gregorian calendar. There are 102 days remaining until the end of the year.
Events：
622 – Muhammad and Abu Bakr arrived in Medina
1058 – Agnes of Poitou and Andrew I of Hungary meet to negotiate about the border-zone in present-dayBurgenland.
1066 – Battle of Fulford, Viking Harald Hardrada defeats earls Morcar and Edwin
1187 – Saladin begins the Siege of Jerusalem.
1260 – the Great Prussian Uprising among the old Prussians begins against the Teutonic Knights.
1378 – Cardinal Robert of Geneva, called by some the "Butcher of Cesena", is elected as Avignon Pope Clement VII, beginning the Papal schism.
1498 – The 1498 Nankai earthquake generates a tsunami that washes away the building housing the statue of theGreat Buddha at Kōtoku-in in Kamakura, Kanagawa, Japan; since then the Buddha has sat in the open air.
1519 – Ferdinand Magellan sets sail from Sanlúcar de Barrameda with about 270 men on his expedition to circumnavigate the globe.
1596 – Diego de Montemayor founds the city of Monterrey in New Spain.
1697 – The Treaty of Ryswick is signed by France, England, Spain, the Holy Roman Empire and the Dutch Republic ending the Nine Years' War(1688–97).
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