Interesting read - My history isn't good enough to judge the veracity of this article, but it doesn't read as the ravings of a lunatic. If anyone else cares to rule on the validity/truthfulness of this article - mt is all ears.
http://www.activistpost.com/2017/01/hidden-history-corruption-friday-13th.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ActivistPost+%28Activist+Post%29
The unlucky Friday the 13th is one of the most well-recognized superstitions in the Western world. This tradition is over 700 years old and has a very interesting origin. During the 12th century, there was a massive religious war that consumed most of Europe and Asia. Europeans referred to these times as “the crusades.” This war lasted centuries ....
Hmmmm ... will leave up, but am discounting heavily.
The guy lost it with me in closing para - reffing to 'Zionist Israel' as being tied in with 'international banking conspiracy theory' - two flaming red flags to my eyes.

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...