Wikipedia:Selected anniversaries/October 20

October 20:

Maria Theresa of Austria

• 1740: Maria Theresa (pictured) assumed the throne of Austria, following the Pragmatic Sanction of 1713.
• 1827: An allied British, French, and Russian naval force destroyed a combined Turkish and Egyptian fleet at the Battle of Navarino, a decisive moment in the Greek War of Independence.
• 1968: Former U.S. First Lady Jacqueline Kennedy married Greek shipping business magnate Aristotle Onassis.
• 1973: Sydney Opera House in Sydney, Australia, was formally opened by Queen Elizabeth II.
• 1991: The Oakland Hills firestorm killed 25 people and destroyed 3,469 homes in Oakland, California, United States.

Recent days: October 19 – October 18 – October 17

More anniversaries:

• September 30
• October 1
• October 2