It has been said that King Philip IV owed the Templars money that he could not repay, which lead to false accusations and the take down of the Templars to prevent from having to pay the money back...
Their influence quickly grew as they set up banks, built fleets of ships and controlled the island of Cypress. Their banking system was ingenious as pilgrims could deposit funds in their home countries and withdraw funds in the Holy Land.
And the rest of the story.... very interesting, if I don't say so myself!
Friday the 13th, 1307, the Knights Templar Are Arrested And Executed