- He is the only King of France to be canonized
- Built a chapel for his collection of relics - Sainte Chapelle in Paris, France (Photo 1)
- Most notable relic in his collection was the Crown of Thorns from the Passion of Jesus (Photo 2)
- The Crown of Thorns was venerated in Constantinople and obtained from Baldwin II
- He would remove a thorn from the crown and give them as gifts to people who married into the family
- The Crown of Thorns was later moved to the Cathedral of Notre Dame (Photo 3)
- The Crown of Thorns is only available for public viewing on Good Friday!
- St. Louis is the patron saint of the Third Order of St. Francis
- St. Louis, Missouri is named after King Louis the IX of France
- Feast Day: August 25
- Saint Anthony Chapel has a piece of the Crown of Thorns (Photo 4)
Saint Anthony Chapel has relics from the Crown of Jesus Christ and Saint King Louis
