Wikipedia:Selected anniversaries/October 13
- 54 - Claudius I was fatally poisoned by his wife Agrippina the younger, making her 17-year old son Nero the next Roman Emperor.
- 1307 - Grand Master Jacques de Molay and thousands of members of the Knights Templar, a monastic military order, were simultaneously arrested by agents of Phillip the Fair and subsequently tortured into "admitting" heresy. From that Friday on, Friday the 13th was considered by followers of the Templars as an evil and unlucky day.
- 1843 - The Independent Order of B'nai B'rith, the oldest continually-operating Jewish service organization in the world, was founded in New York City.
- 1943 - World War II: With a new government led by General Pietro Badoglio, parts of Italy switched sides to the Allies and declared war on Germany and Japan as well as Northern Italy.
- 1994 - Mosaic Netscape 0.9, soon called Netscape Navigator was released, an important product in the history of web browsers.
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