San Luis Potosi is the capital and the most populous city in the Mexican state of the same name, San Luis Potosi. The city is commonly called San Luis and has a population of over 700,000 in the city proper, and over 1,000,000 in the metropolitan area, making it the tenth largest in the country. San Luis was named after Louis IX of France, who is the city’s patron saint. Potosi was added to the name in reference to the silver and gold mines which were the reason the city was founded, in 1592. San Luis is a city with more than four hundred years of history and culture.