Origins
The origin of the Friday the 13th superstition has been linked to the belief that there were 13 people at the last supper of Jesus, who was crucified on Good Friday, but it probably originated in medieval times. It has also been linked to the fact that a lunisolar calendar must have 13 months in some years, while the solar Gregorian calendar and lunar Islamic calendar always have 12 months in a year. Another suggestion is that the belief originated in a Norse myth about twelve gods having a feast in Valhalla. The mischievous Loki gate-crashed the party as an uninvited 13th guest and arranged for Hod, the blind god of darkness, to throw a branch of mistletoe at Balder, the god of joy and gladness. Balder was killed instantly and the Earth was plunged into darkness and mourning as a result.
A Friday occurring on the 13th day of any month is considered to be a day of bad luck in many superstitions around the globe. Similar superstitions exist in some other traditions. In Greece and Spain, for example, Tuesday the 13th takes the same role. The fear of Friday the 13th is called paraskavedekatriaphobia, paraskevidekatriaphobia or friggatriskaidekaphobia, a specialized form of triskaidekaphobia, a phobia (fear) of the number thirteen.
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