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1740Maria Theresa came to powerOn 20 October 1740, Maria Theresa became ruler of the Habsburg lands, including Austria, Hungary and Bohemia, after…1827The Battle of Navarino was foughtOn 20 October 1827, a combined British, French and Russian fleet destroyed an Ottoman and Egyptian fleet in…1973The Sydney Opera House was openedOn 20 October 1973, Queen Elizabeth II opened the Sydney Opera House. Designed by the Danish architect Jørn…
