When Christ and his disciples sat down to the Last Supper, there were thirteen at the table. The first person to leave the table was Judas Iscariot, who, after betraying Christ, hanged himself. Hence the superstition that if 13 persons sit at table together, the first to rise will die within a year.
Experience shows such a belief to be without foundation, yet it is widespread, and the number 13 is unpopular generally. Many streets contain no house, and many hotels no room bearing the ‘unlucky’ number.