Apr 25, 2014 Happy Birthday St. Louis IX - Happy Birthday St. Louis STL250 Today marks the 800th birthday of Louis IX the only French king to become a saint and namesake of the Gateway to the West, St. Louis MO. There is celebrating all year long in St. Louis for this is the 250th birthday of the city. For information on the many events city wide and for some great photos and history visit STL250 on Facebook and @ www.stl250.org.We suggest a French Silk Pie as the Birthday Pie fit for a King AND Saint.