How did the fear of "triskaidekaphobia" originate?

Question

How did the fear of "triskaidekaphobia" originate?

Answer 1

Probably some religious nuts started it.  There are some interesting coincidences regarding the #13.

12 apostles + jesus

supposedly 13 witches in a coven

Friday the 13th - the day the Knights Templar were killed

13 full moons in a year

Answer 2

Some Christian traditions have it that at the Last Supper, Judas, the disciple who betrayed Jesus, was the 13th to sit at the table, and that for this reason 13 is considered to carry a curse of sorts. However, the number 13 is not uniformly bad in the Judeo-Christian tradition. For example, the 13 attributes of God (also called the thirteen attributes of mercy) are enumerated in the Torah (Exodus 34: 6-7).[1] Some modern Christian churches also use 13 attributes of God in sermons.

Triskaidekaphobia may have also affected the Vikings—it is believed that Loki in the Norse pantheon was the 13th god[citation needed]. More specifically, Loki was believed to have engineered the murder of Baldr, and was the 13th guest to arrive at the funeral[citation needed]. This is perhaps related to the superstition that if thirteen people gather, one of them will die in the following year. This was later Christianized in some traditions into saying that Satan was the 13th angel[citation needed]. Another Norse tradition involves the myth of Norna-Gest: when the uninvited norns showed up at his birthday celebration—thus increasing the number of guests from ten to thirteen—[citation needed]the norns cursed the infant by magically binding his lifespan to that of a mystic candle they presented to him.

The Mesopotamian Code of Hammurabi (ca. 1760 BC) omits 13 in its numbered list. This seems to indicate a superstition existed long before the Christian era.

Answer 3

"Triskaidepaphobia"?

Is that the fear of the number 13?

The number 13 has always had some negative connotations

Judas was the 13th apostle

Loki was the 13th god, etc

So eventually, people would begin to devlop an actual "fear" of the number