Friday the 13th occurs when the thirteenth day of a month falls on Friday, which superstition holds to be a day of good or bad luck. In the Gregorian Calendar, this day occurs at least once, but at most three times a year.
According to folklorists, there is no written evidence for a "Friday the 13th" superstition before the 19th century. The earliest known documented reference in English occurs in an 1869 biography of Gioachino Rossini:
[Rossini] was surrounded to the last by admiring and affectionate friends; and if it be true that, like so many other Italians, he regarded Friday as an unlucky day, and thirteen as an unlucky number, it is remarkable that on Friday, the 13th of November, he died
