Pope Gregory XII was appointed head of the Catholic Church by a conclave of 15 cardinals in Rome.
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Pink Floyd released their eleventh studio album titled The Wall.
German archaeologist Heinrich Schliemann found The Mask of Agamemnon at the Greek site of Mycenae.
OpenAI launched ChatGPT as a prototype.
The world's first international soccer match took place.
The Balmis Expedition began in Spain. It's considered the first international healthcare expedition in history.
