The fear and superstition around Friday the 13th comes from a mix of religious traditions, ancient myths, and later cultural stories. No single event created it; instead, several ideas merged over time.
In many Western traditions, 12 was seen as a “complete” number (12 months, 12 zodiac signs, 12 gods of Olympus). Because of this, 13 was viewed as irregular or disruptive.
A famous example comes from the Last Supper, where 13 people were present—Jesus Christ and his 12 apostles. Tradition holds that the 13th guest, Judas Iscariot, later betrayed Jesus. This helped reinforce the idea that 13 at a table was unlucky.
In medieval Europe, Friday had negative associations in Christian tradition. According to belief, several unfortunate events were said to have occurred on a Friday, including the crucifixion of Jesus Christ.
Because of this, Friday was sometimes viewed as an unlucky day for travel, business deals, or starting new ventures.
One real historical event sometimes associated with the myth happened on October 13, 1307, when Knights Templar were arrested across France by order of Philip IV of France.
This occurred on a Friday the 13th and led to torture, trials, and executions. While historians debate whether this created the superstition, the story strengthened the date’s dark reputation.
The superstition became widely known in modern culture through books and movies, especially the horror franchise Friday the 13th, which helped cement the idea that the date is mysterious or unlucky.
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