On Friday, October 13, 1307, King Philip IV of France ordered a baseless persecution of the Knights Templar. During this event, Grand Master Jacques de Molay reportedly cursed his persecutors as he was burned at the stake. This moment marked the beginning of a superstition that has persisted for centuries.
In Western culture, Friday the 13th is considered an unlucky day. But where does this belief originate? Experts suggest that its roots are deeper than simple religious connotations.

The Religious Links to Friday the 13th
One potential origin is the Last Supper, which featured 13 individuals: Jesus and his 12 apostles. The following day, Friday, marked Jesus’ crucifixion, further associating the date with misfortune.
Perhaps the most famous historical event tied to Friday the 13th is the persecution of the Knights Templar. On Friday, October 13, 1307, King Philip IV launched a brutal campaign against the order. Members were arrested, tortured, and tried by the Inquisition for alleged crimes including heresy, sacrilege, sodomy, and idol worship.

Philip IV had also persuaded Pope Clement V to support the persecution. While the charges were officially religious, many historians believe the true motive was financial. The Knights Templar held vast wealth and were creditors to many powerful institutions, including the heavily indebted French monarchy.
The Templar Curse
The Grand Master of the Knights Templar, Jacques de Molay, became a legendary figure in this story. As he faced execution by fire, chroniclers claim he declared:
“God knows that we have been unjustly condemned. An immense calamity will soon befall those who have judged us without respect for true justice. God will avenge our deaths. I die with this certainty.”
This dramatic moment, whether myth or reality, contributed to the enduring mystery and superstition surrounding Friday the 13th.

Friday the 13th Through History
The Templar story is not the only event associated with Friday the 13th. Throughout history, many other incidents have occurred on this date, further fueling the superstition.
Statistically, Friday is the weekday most likely to coincide with the 13th of any given month. In a cycle of 4,800 months, the 13th falls on a Friday 688 times, adding a numerical curiosity to the superstition.
This article was originally written in Spanish in Ecoosfera
