<P> A suggested origin of the superstition--Friday, 13 October 1307, the date Philip IV of France arrested hundreds of the Knights Templar--may not have been formulated until the 20th century . It is mentioned in the 1955 Maurice Druon historical novel The Iron King (Le Roi de fer), John J. Robinson's 1989 work Born in Blood: The Lost Secrets of Freemasonry, Dan Brown's 2003 novel The Da Vinci Code and Steve Berry's The Templar Legacy (2006). </P> <P> In Spanish - speaking countries, instead of Friday, Tuesday the 13th (martes trece) is considered a day of bad luck . </P> <P> The Greeks also consider Tuesday (and especially the 13th) an unlucky day . Tuesday is considered dominated by the influence of Ares, the god of war (Mars in Roman mythology). The fall of Constantinople to the Fourth Crusade occurred on Tuesday, April 13, 1204, and the Fall of Constantinople to the Ottomans happened on Tuesday, 29 May 1453, events that strengthen the superstition about Tuesday . In addition, in Greek the name of the day is Triti (Τρίτη) meaning the third (day of the week), adding weight to the superstition, since bad luck is said to "come in threes". </P> <P> Tuesday the 13th occurs in a month that begins on a Thursday . </P>

Where did the superstition of friday the 13th originate