Good day @adalger, interesting post. I'd never heard of the "Paraskavedekatriaphobia" part, but I was familiar with Triskaidekaphobia.
I'd also like to add a bit of legend (definitely debunked).
You've heard of the "Knights Templar"?
By the middle of the middle ages, they were immensely powerful, rich and owned a GREAT amount of real estate across Europe.
The King of France ( Philip IV of France) colluded with the Catholic Church, so that the Templars were disbanded, their property confiscated by the Crown and the church, their members (especially their leaders) were hunted down and executed.
The LEGEND was that all this occurred on Friday the 13th.The events are true, the date for the events are not.
King Philip did his thing in 1307, Pope Clement V did his in 1312