Wikipedia:Selected anniversaries/May 22
May 22: World Biodiversity Day.
- 1455 - Forces led by Richard, Duke of York and Richard, Earl of Warwick captured Lancastrian King Henry VI of England, beginning the Wars of the Roses with a Yorkist victory in the First Battle of St Albans.
- 1809 - Austrian forces under Archduke Charles (pictured) defeated Napoleon I and his French troops at the Battle of Aspern-Essling.
- 1915 - Five trains collided near Gretna Green, Scotland, killing 227 people and injuring 246 in the Quintinshill rail crash.
- 1960 - Valdivia, Chile was devastated as the epicenter of the 9.5-magnitude Great Chilean Earthquake, with destructive tsunamis reaching Hilo, Hawaii the following day.
- 1990 - The Yemen Arab Republic and the People's Democratic Republic of Yemen merged to become the Republic of Yemen.