Beethoven premiered Fidelio in Vienna, Austria, which was his only opera.
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Toshiba rolled out a four-legged robot designed to clean up after nuclear disasters.
The American state of New Jersey was the first state to ratify the Bill of Rights.
Roman soldier Diocletian was appointed the new Roman Emperor after Roman Emperor Carus's death.
Zumbi, the last of the Quilombo dos Palmares kings, was killed.
Oxford Dictionaries declared 'climate emergency' as the word of the year for 2019.
