In the early morning hours of Friday October 13, 1307, under the orders of King Philip the Fair, the Knights Templar were arrested.

“Dieu n’est pas content, nous avons des ennemis de la foi dans le Royaume” | “God is not pleased. We have enemies of the faith in the kingdom.” 
Arrest warrant signed by Philip the Fair.

Philip the Fair (1268-1314). States General of 1302
From the 1968 History of France set
Designed by Albert Decaris

In addition to their military might, the Templars also developed a sophisticated banking system that was ahead of its time. Pilgrims could deposit funds at their local Templar preceptory in Europe and withdraw the equivalent amount in the Holy Land, instead of having to carry money on the dangerous journey east.

The Templars‘ complex financial dealings, along with their tax-exempt status and extensive donations from wealthy patrons, allowed them to amass tremendous wealth and influence. At their height, the Templars were one of the most powerful organizations in medieval Europe, with close ties to the nobility, the clergy and the papacy.
The Shocking Demise of the Knights Templar: A Cautionary Tale of Medieval Power and Persecution – History Tools

Philip’s people surprised the Templars with a well coordinated, mass arrest of all the Knights in France. After extensive torture, and show trials hundreds (possibly thousands) of Knights were executed, allowing Phillip to seize both the vast wealth held by the Templars and their lands. He used this new found wealth to expand France military campaigns and territories. 

Philip, because of his wars with England and Flanders, was chronically short of money. This led him to look at the Templars who were a very wealthy order in France and who pledged their allegiance to the Pope above the King. Again alleged heresies began to circulate about the order for example; they worshipped an idol and spat on the crucifix … [Pope] Clement V at first tried to fight these charges but eventually succumbed to pressure from a determined Philip (SC 7/10/40). The Templars in France, unlike the ones in England, were subjected to torture and so often confessed to these heresies. There was shock throughout Europe when all Templars were arrested in France on the same day in 1307.  By March 1314 the last of the Templars were burnt at the stake, supposedly cursing the Pope and Philip IV that they would both die within the year. 
[ARCHIVED CONTENT] The Templars’ ‘curse’ on the King of France – The National Archives blog

“A Heresy of State. Philip the Fair, the Trial of the ‘Perfidious Templars’, and the Pontificalization of the French Monarchy”, in “Journal of Medieval Religious Cultures”, 39/2, 2013, p. 117-148. has a good article on the trials. You can sign up for a free account to download the pdf. 

Last year’s SOD celebrated the founding of Ankara as the new capitol of the Republic of Türkiye.