What happend on 20th September

19.09
21.09
1860

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

1854

Battle of Alma: British and French troops defeat Russians in the Crimea.

1737

Runner Edward Marshall completes his journey in the Walking Purchase forcing the cession of 1.2 million acres (4,860 km²) of Lenape-Delaware tribal land to the Pennsylvania Colony.

1596

Diego de Montemayor founded the city of Monterrey in New Spain.

1377

Cardinal Robert of Geneva, called by some the Butcher of Cesena, is elected as Avignon Pope Clement VII, beginning the Papal schism.

1187

Saladin begins the Siege of Jerusalem.