Templars, were among the most famous of the Western Christian military orders. The organization existed for approximately two centuries in the Middle Ages. The secrecy around the powerful medieval Order of the Knights Templar has led to Knights Templar legends. These range from rumors about their association with the Holy Grail and the Ark of the Covenant, to questions about their association with the Freemasons, to searches for a lost treasure. Speculation about the Templars has increased because of references to them in bestselling books such as The Da Vinci Code and films such as Indiana Jones and the Last Crusade and National Treasure.