How did friday the 13 start?

Answer 1

It's unclear where the original fear of Friday the 13th began. The concept of the unlucky day has been traced back to the nineteenth century, but there are mentions of it being a bad day for travel, and important events can be traced back to the 14th century.

Answer 2

I heard that a prior Pope ordered a group of knights called the Knights Templar to be founded for the protection of the Pope, but a later Pope had every knight in the group murdered because they were supposedly too powerful. The mass execution happened on Friday the 13th . And I even heard that a little girl had her 13th birthday on Friday the 13th. She went abroad to America on her birthday with her parents and her airplane seat was number 13. They went into a hotel and their room was number 13 on the 13th floor. When they went into the lift and arrived to floor 13, the lift's rope was cut and they fell down and died.