Friday the 13th: Why Is It So Famous?

Friday the 13th is one of the most well-known superstitions, often associated with bad luck, eerie occurrences, and a sense of foreboding. But how did this date get so famous, and why does it still spark such fascination today?

Friday and the 13th Superstitions

The superstition surrounding the number 13 goes back to the 17th century. The number 12 is often seen as a "complete" number—think of the 12 months of the year, 12 zodiac signs, and 12 apostles in Christianity. Adding one more to that harmonious number was believed to create imbalance, making 13 unlucky to many cultures.

Fridays also have a history of being associated with misfortune in various cultures, with roots that trace back to religious traditions, historical events, and cultural beliefs.  In the Middle Ages, Friday was execution day and for the Catholic religion it was the day for penance.  So when Friday and the number 13 combine, they create a "perfect storm" of superstition for some.

Origins That Have Shaped the Myth

One event often tied to the superstition occurred on Friday, October 13, 1307. On this day, King Philip IV of France ordered the arrest of hundreds of Knights Templar, accusing them of heresy. Many believe this tragic event cemented Friday the 13th as an unlucky day in European folklore.

Among sailors, Fridays were traditionally seen as an inauspicious day to begin a voyage. British naval lore even tells of an effort to disprove this superstition by commissioning a ship named HMS Friday, with its keel laid on a Friday, its crew selected on a Friday, and its maiden voyage launched on—you guessed it—a Friday. According to legend, the ship mysteriously vanished, though there’s no evidence to confirm this story.

Back in medieval Europe, Fridays were associated with witchcraft and magic. It was believed that witches held their sabbaths, or gatherings, on Fridays, further linking the day to dark and supernatural forces.

In modern times, the superstition gained widespread popularity thanks to literature and pop culture. In 1907, Thomas W. Lawson’s novel Friday, the Thirteenth told the story of a stockbroker who uses the date's bad reputation to manipulate the stock market. The book's success amplified the superstition. Later, the Friday the 13th film franchise, launched in 1980, brought the superstition to new heights of cultural relevance with its iconic slasher villain, Jason Voorhees.

Not Always Friday, or the 13th

While Friday the 13th is infamous in many Western cultures, other societies have their own unlucky days steeped in tradition and superstition.

• Tuesday the 13th (Spanish-Speaking Countries): Tuesday the 13th is considered unlucky rather than Friday. The day has a strong association with bad luck due to the ancient Roman god of war, Mars (Martes in Spanish). The superstition is summed up in the popular saying: "En martes, ni te cases ni te embarques" ("On Tuesday, neither marry nor embark [on a journey]").
• Wednesday the 24th (Ghana): Wednesday is seen as particularly inauspicious for funerals or important ceremonies. The day is thought to bring bad luck or disrupt the spirits of the deceased.
• Saturday the 14th (Italy): While the number 13 is unlucky in many cultures, Italians traditionally consider 17 to be the most unlucky number. This is because, in Roman numerals (XVII), 17 can be rearranged to form VIXI, meaning "I have lived" in Latin—a phrase associated with death.
• Mondays (Middle East): In some Middle Eastern countries, Mondays are associated with bad luck. This stems from the Islamic tradition where certain days of the week are better for specific activities. While not universally unlucky, Mondays are often avoided for starting new ventures or making significant life changes.
• Thursday the 12th (Nordic Countries): In Scandinavian folklore, Thursdays are associated with Thor, the Norse god of thunder and storms. While generally seen as a day of strength, it was also considered risky to undertake journeys or important ventures due to Thor’s connection with volatile weather and potential conflict.
• April 4th (China & Japan): The number 4 is considered unlucky in many East Asian cultures because it sounds similar to the word for "death" in both Mandarin (sì) and Japanese (shi). Days like April 4th (4/4) or any date featuring repeated fours are often avoided for major life events like weddings or hospital visits.

A Superstition That Endures

Superstitions like Friday the 13th and other culturally unlucky days remind us of humanity’s deep-rooted desire to explain the unexplainable. Whether stemming from historical events, religious beliefs, or ancient folklore, these dates show how traditions shape our perceptions of luck and misfortune. While some may dismiss them as mere myths, their enduring presence in our collective consciousness proves they still hold a certain power over us—whether we believe in them or not.

Whether you consider it an unlucky day or just another date on the calendar, Friday the 13th continues to be a part of global conversations, blending history, superstition, and pop culture into one memorable phenomenon.