Friday the 13th's reputation as an unlucky day stems from a combination of religious, historical, and mythological associations, particularly blending the fear of the number 13 with the traditional misfortune of Fridays
. Key roots include the 13th guest at the Last Supper, the arrest of the Knights Templar in 1307, and ancient Norse myths.- Religious & Biblical Roots: The number 13 is often linked to the Last Supper, where 13 people were present, with Judas (the 13th guest) betraying Jesus on a Friday. Additionally, it is traditionally believed that Eve gave Adam the forbidden fruit on a Friday, and it was the day Cain killed Abel.
- Knights Templar Arrest: A significant historical turning point was Friday, October 13, 1307, when King Philip IV of France ordered the mass arrest of the Knights Templar, leading to their torture and execution.
- Norse Mythology: A banquet in Valhalla was interrupted by Loki, the 13th guest, who orchestrated the death of Balder, establishing 13 as a chaotic number.
- Cultural Context: In Western culture, 12 is often considered a "complete" number (12 months, 12 zodiac signs), making 13 an irregular, unsettling disruption.
- Modern Popularization: While rooted in older beliefs, the specific, widespread superstition of "Friday the 13th" gained prominence in the late 19th and early 20th centuries, partly through literature.
The fear of the number 13 is known as triskaidekaphobia, while the fear of Friday the 13th is called friggatriskaidekaphobia.











